It's a good build, but some things:
1. That wood is gonna bring in mold like crazy. Unless it's been treated, the condensation will rot that shit and it's gonna be fucked in no time. Also the weight. In a full size van with adequate suspension it would be fine but a minivan based off a car chassis is gonna be a struggle.
2. Those generation of Honda vans are well known for the catastrophic tranny failure. I actually passed on a van for a good price because I knew of the well documented failures of those transmissions.
Still, a good build. If you just wanted a weekend scrambler it would be fine but I wouldn't want to live in it full time.