Trying not to re-invent the wheel

I have been lurking that past week or so after seeing a Teardrop for sale. I've got a VW Golf TDI and want to cruise around on my summers spearfishing and surfing the coast. I'm a teacher BTW that's why I have my summers off. Well when I'm not working on my Masters
My goal is a quick assembly like the weekender, but with an A/C unit. No my problem is I'd really like to keep it 8' long. I've got a 22"x22'X46" cooler that will be in the rear storage with a slide off rear section. I'd like to put a 12x12x15 AC unit in the back shelf and use the rest of the shelf for outdoor storage. I played around with Google's 3d program and designed something like I'd like, but I'm afraid it crashed when I tried to import an window unit. Can anyone point me in the direction for some weekend assembly plans so I can get on the road ASAP. I've got a HF 4x8 trailer all ready to go!
BTW I've been reading and lost of people are welding up the HF trailers to make them one piece. Do you guys know they come with carriage bolts now that bolt them to the frame and make it solid? I put mine together following the manufactures directions then wondered what all the excess bolts were. Come to find out the bolt down the rear section of the frame. Shouldn't be any need for welding it solid once you get a 3/4 piece of plywood on top.

BTW I've been reading and lost of people are welding up the HF trailers to make them one piece. Do you guys know they come with carriage bolts now that bolt them to the frame and make it solid? I put mine together following the manufactures directions then wondered what all the excess bolts were. Come to find out the bolt down the rear section of the frame. Shouldn't be any need for welding it solid once you get a 3/4 piece of plywood on top.