I have done 4 swaps of westy interiors to passenger models. The
swap is fairly simple except for the pop-top. This I have done on 2 of
the projects, once without the factory upper bed and once with. I do not
recommend trying to make the top bed fit. Cutting the hole is quite easy
with a small jig saw, but the hole should be made slightly smaller than
the factory size. Plan how you are going to finish and trim the
headliner first!  Other than the top, the westy stuff can be swapped in
about two days by 2 people who are handy with tools . To do the top is
another 2-4 days depending on wether you try to use the factory bed.  I
would not use one again because it requires cutting a much larger hole
and adding re-inforcing cross tubes to the upper body to support the
bed.

Mark
87 syncro self-westied
86 syncro GL