Welcome to the FUN that is truck conversions.
Doc and I have very similar trucks (his is finished nicer than mine. But like you, I work on diesels, so I get covered in crap daily and no point in spending a small fortune on the inside only to ruin it a couple months later).
I posted a couple more pics under my thread (And So The Adventure Begins) if you need any basic (and I do mean basic) ideas.