Enclosed trailer to be camping trailer?

I think it's doable assuming you have the skills and tools to do the job. My DH has a smaller utility trailer he uses for his RC airplanes and he constantly says he wished he had one with the side door also. Looks like you're covered on this. I also was thinking about the emergency exits and how you could remove the swing bar to make sure you're not locked in.....then I remembered that our Rockwood has 2 doors and both of them have the large swing handles which keep them from being opened from the inside. So assuming you go with this project, would strongly suggest you contact one of the RV manufacturers and check out the emergency window and add that. It's not for everyday open and close, but for emergency only, so you might want to be a third window. You should be able to pick up some cabinets at a builders outlet or one of the regular DIY places to set up a kitchen work area.

A few concerns would be getting money and time invested and then decide you really would prefer a standard trailer....might have trouble finding a buyer and you might be out $6000 or more. Have you looked into a hybrid travel trailer? They generally are less $ and even if you had to do some driving to pick it up, you might come out ahead. You should be able to find a few year old hybrid for the $6000 - $8000 range. I know that hybrids are scarce in CA, but you could do some online searching and maybe work out something within a reasonable drive. Comfortwise, I know you'd be ahead. I would continue with your homework on this and price it out vs something ready to go. Good luck.