I did a ton of modifications to my unit, nothing that would void the warranty, a new door for the water valves that a fitting was leaking and was inacsessible from inside or outside, the "dealer" could never find it, took a bore scope to find, couch had to be lifted to remove front pannel to store anything, replaced with unit that has acsess doors and a window and light to see how much water the tank has since the gauges quit in three month, cut hole in kitchen counter by corner because I can place a trash can in side locker compartment and not in the kichen.
Adjusted the height of the front seats 3" up with heavy duty steel chanels, hate sitting on the floor, wish I could replace them with F-150 seats,installed fantastic fans, one had to have 12v dc routed to it since the manufaturer never even thought of it, installed small LED lamps inside to have some light in the places that are far away from any light, some place in Arizona or New Mexico as in desert, since one night we went to a friends place in the desert and I could not see where my rig was after a half hour of waiting for my night vision to return, I still coul not see the rig, now I have a small amber LED pointig 45> degrees down so as to not blind the negborhood.
So yes you can do modifications yust make shure that you do not do anythind dumb, the walls of an RV are not the same as a house, very thin skis and not many "studs" and some times there are electric wires runing down or under cabinets hidden in between.
navegator