Is there an RV manufacturer near you? If so, see if they have tours. This might give you enough information to know if it is possible. The major problem I see is you will be limited on what you can put where because it will be virtually impossible to run different wiring after the unit is built.
I worked for a local company from 1990 to 1999 that did mobile audio and phones and security. They hired a guy on the retail end that built competition and custom audio for vehicles. A client he brought to the store was having a Prevost coach built to his specs and wanted our guy to do the A/V system. Flew him to Florida to go over where things would be built in for speakers, what cabling to install where, the whole nine yards. Went back to verify everything before it was too late to change things, then installed his part here in Ft. Worth. I got to walk in and see everything. This was a million dollar plus coach. Looked like something from the TV shows.
The trick will be to see if after the fact, much can be changed or upgraded. It may be very limiting. If no builders close to you, go poke through a few R/V dealers, even the used ones. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3