Here's a view of the shower pan and first two walls up.
Walls are redwood tongue and groove that I glued together then four coats of clear poly.
Jack,
Thanks for the suggestion on the shower pan, it now has 3/4" slope from edge to drain, did a rough test and water heads down the drain. Should be
easier to get water out when bus isn't level.
Don't know if I did it right, cut strips of wood with the slope I wanted and glued them to the base.
Then filled the gaps with body filler.
Then I recoated everything with the shower waterproofing stuff, then painted.