If you went a Jayco job, if you can get one, seeing as its one piece then the roof would need to be chocked to hold it up while you removed the internal strut affair, the stiffeners aren't a biggy for a trimmer, just a pocket, easy to add plus with a Trimmer you would get it with a velcro joiner or even a zip, so you can fit it easier, then you have dodged the difficult bit, removing and replacing would be a doddle , the electrical isn't a biggy either, just get a velcro flap made on the new one which holds the cable runner in place and no need to disconnect any of it ... So really one man job as youv'e worked around the heavy stuff and made a better bit of gear at same time ...................
Far better to take Van to trimmer so he can measure things up, see the how and why of the mods you want and then he knows exactly what your talking about, met too many people who just describe or draw pictures, do the tape work themselves and its stuffed up, far better for them to see it in the flesh then when you remove it take it to him for cross refence .. I would think removal would be a couple of hours if that, few hundred screw and carefull trim with a knife, fitting not much longer as you have only removed the vinyl the rest is still in place.... a stage so you can get around the outside would be needed.... When they do the measureing its their problem plus less chance of van getting damaged..
To hold the roof up, just remembered cut 4 pieces of pvc pipe for each corner of the roof, just like storm posts, they will make sure the roof doesn't drop......
Well thats my 5 bobs worth......
