Unless it was for the sheer joy of doing the work yourself, is there any particular reason you didn't buy a gently used motorhome for $15-20k and upgrade as necessary (e.g. the solar array and lithium batteries)? You cite the $50k cost but that sounds excessive to me with considerably less work.
You cannot buy a good 25' motorhome for $15-20k. You might be able to find a 20+ year old one with an under powered gas engine. In that case everything will be outdated and need upgrading.
Most RVs are made out of low grade materials like particleboard and MDF. I used neither. They are not made to be lived in and fall apart quickly.
None of them have a work area either. You end up using a laptop on the dinette or turn it into a desk and lose an eating area. I built a dedicated standing desk with a large monitor.
Nearly all RVs are built for intermittent (recreational!) use and specifically not designed for full-time living. Of course some people do it anyway, and they fall apart quickly.
