New Build questions. Point me straight on my thoughts.

Hello All
I am about to start my build. I have been a member on TNTT for a couple years or so and have followed many builds and learned so much from you all. Thank You all for the immense amount of knowledge you have all shared.
I have purchased the Fredrick's manual and am considering the Kuffel creek plans. But my build leaves me with a few question before I start. And they may have be answered before, but I have not found all the answers I was looking for yet in previous entries.
The plan is to use the Benroy for local outings as well and long distance tours. As for off roading, I doubt I will do much of that. I may take a wander down a gravel road or a old logging trail but that will not be my standard trip. I live in Toronto so trips to northern Ontario as well as a south west tour through California. I also travel to Florida regularly and plan on camping there as well. My tow vehicle is a Ram 1500 pickup. Therefore trailer weight isn't the issue other than considerations for fuel consumption and drive-ability. I am just trying to seek a balance of weight and economics.
Many Thanks for taking the time to read this post. Looking forward to your suggestions.
Kindest Regards
Peter
I am about to start my build. I have been a member on TNTT for a couple years or so and have followed many builds and learned so much from you all. Thank You all for the immense amount of knowledge you have all shared.
I have purchased the Fredrick's manual and am considering the Kuffel creek plans. But my build leaves me with a few question before I start. And they may have be answered before, but I have not found all the answers I was looking for yet in previous entries.
The plan is to use the Benroy for local outings as well and long distance tours. As for off roading, I doubt I will do much of that. I may take a wander down a gravel road or a old logging trail but that will not be my standard trip. I live in Toronto so trips to northern Ontario as well as a south west tour through California. I also travel to Florida regularly and plan on camping there as well. My tow vehicle is a Ram 1500 pickup. Therefore trailer weight isn't the issue other than considerations for fuel consumption and drive-ability. I am just trying to seek a balance of weight and economics.
- A standard queen bed is 60". I was going top make the Benroy with a custom 5' x 10' or 5' x 11' trailer. I would like 3/4" plywood walls to support a canoe or a pair of bikes on the roof. If I use 3/4" ply with 3/4" insulation and 1/8" interior walls that would leave me 60" - ((.75" + .75" + .125") * 2)) = 58 1/4" inside between the walls. Do you just squeeze a queen in to the space and not worry about it or make the trailer 5' 2 " wide. I would think changing bed sheets to be difficult when the bed is crowded against the wall. Which means making the roof and skinning it with aluminium a wee bit more difficult and expensive. I am ok with a 6' wide trailer if need be. I am just trying to resist the first time builders over design.
- Is it worth doing CEPS on the exterior walls followed by a layer of light fiberglass mat and epoxy before I skin with aluminium. Mainly to resist moisture but also to give it rigidity.
- A friend has some experience building commercial trailers, and has advised me to resist using steel tubing because of rust. He is leaning me toward steel C Channel. Main reason being here in Southern Ontario there will be condensation that happens and will cause the frame to rust from the inside out. Other than shouldering the C Channel with a steel plate at the Timbren axles I don't see an issue with using C Channel. I have seen a few builds with C Channel but I am not sure of any down sides to using it.
- I have also considered aluminium tube for a trailer frame. The issue I have is welding aluminium and the additional cost, as I feel you need a heavier thickness in the wall of the square tube. This also brings other worries to the table when you mount the Timbren axles as they are steel. Thus I worry about galvanic corrosion. Crushing the tube is also a worry when cranking down the bolts.
- The material for the exterior walls will be covered with CPES so is it crucial to use BB or is exterior fir or spruce acceptable?
- I am comfortable with doing the electric wiring. I was considering a WFCO or Progressive Dynamics power center for its neatness and compactness. I could just as easily wire a panel/converter system, battery charger with future provisions for a solar system (in the future). Is there any advantage to the PD or WFCO systems? Or is this just a preference.
- I will not do any winter camping in Ontario, but will in the south (Florida etc) Winter in Florida can be cool in the evenings so I don't worry about A/C. Desserts in AZ are cool at night as well. Is there a need for A/C ?
Many Thanks for taking the time to read this post. Looking forward to your suggestions.
Kindest Regards
Peter