Roger
Access Denied is how I have coped with a shower and porta potty.
I built the shower cubicle using fibreglass covered plywood, the cubicle followed the contours of the van which gives another 25cm of space to play around with.
The walls were made from plywood and "stitched" together using cable ties, then fibreglassed around the joins. The ties are then removed. If you weblookup "stitch and glue" you'll get plenty of hits on how to do it. The internal corners are filled and rounded with resin and micro balloons.
I built the shower cubicle using fibreglass covered plywood, the cubicle followed the contours of the van which gives another 25cm of space to play around with.
The walls were made from plywood and "stitched" together using cable ties, then fibreglassed around the joins. The ties are then removed. If you weblookup "stitch and glue" you'll get plenty of hits on how to do it. The internal corners are filled and rounded with resin and micro balloons.