There are many options out there. If I could afford it I would look at all, keep what works, toss what doesn't and get it made to my specifications, but from prices I've been quoted on making my own, can't afford it.
We have a Paha Screen Room, which we like very much, but its not perfect. We also like something over the galley that can be screened in. The more bug proof it is the better, but ventilation a big deal when camping in areas where the temps over a hundred.
We tried an ez up, returned it. Although a decent canopy, with the screen room unable to get it far enough over the galley area to clear the hatch. What happened was the metal in the frame work scratching the hatch area. We have gone to a 60 dollar Texsport 9X12 screen room designed to sit over picnic tables. It's cheap, but is close to doing the job and takes under 5 minutes to put up or take down. I've concluded that to meet our needs either need a SUV screen room, not tent or a canopy with straight legs. Straight legs would allow it to be moved up along the trailer side without interfering with the side screen room.
So far I've not found a SUV one that is open as the common screen rooms although some do have an attached screen room, but area covering the galley still too enclosed. The straight leg canopy might be the answer, but from what I've seen the prices for those as opposed to angle leg ones substantially higher which makes no sense.
The original poster asked about custom made tents/screen rooms and we've got way off topic, but I see there are few that have gone to the trouble and expense in having one custom made. Most, like me, trying to make what's available work.
The Camp Inn privacy tent is another subject. Made in America by a quality craftsman or not, a very high price to pay for an item that other made in China, less quality and all starts at $35.00 and goes up to around $150.00. The Paha Que model being the most expensive at around 300 as well. I can see 3 or 400 for a 10X10 screen room , but not for a privacy tent. That is just my opinion. I see the privacy tent as something not utilized as much as a screen room and with reasonable care less quality would still last years. Again just my opinion and I'm sure others don't share it, but last time I looked we all had the right to our own opinions and controversy and discussion is what these boards are for. We all can learn from others opinions and ideas.