Fabulous build!!
Curious, did you choose a macerating toilet to simplify waste line to black tank?
Also, do you have any pictures that show shower / toilet plumbing lines under the van?
Thanks! Macerating toilet was for two reasons:
1) Complete odor isolation from black tank
2) To have more flexibility on placement of toilet vs black tank
I've had conventional black tanks before and they're OK when fresh but in hot summers the stink just gets out. And in this van, the bath is right next to the kitchen and the seating area--unlike my past conversion vans that had the toilet in the very back. The macerating toilet just eliminates that issue.
And then of course you can mount your black tank away from your toilet. Mine ended up not all that far apart, but with the 1" waste line I was able to put both where they fit best. With the tight spaces inside the van and all the frame members, brake lines, etc. there are very few locations where you could put a conventional 3" black tank drain hole with the toilet fitting in the space available above and a tank fitting in the space below. Even more so if you are using a purchased shower pan like I did, both the shower drain and the toilet drain locations are constrained.
I do have some pictures, I'll dig up some and post.