Like you I have done a full fitout in my T6 and used a SCA roof that i fitted. One of the biggest problems i have had since completing the job in 2016/17, and now having driven 45,oookm all around Australia is the single house battery fitted under the passengers seat. That has given me some heart ache with some of the seat wires shorting out at one point due to the swivelling seat. The biggest deep cycle battery I could fit appeared to be a 55ah wit’s a 250w solar panel on the roof as well but it is really not big enough and i would like to fit a bigger battery. With limited space i noted that you appeared to also put one under the drivers seat. Have you linked the two together?
Garry
Garry