One suggestion:
Instead of painting the wall, why not get some sheeting from a fabric
store and stretch that onto a large frame. It comes in 108 inch
widths so you'll be getting the "whole wall" effect, but you have the
option of moving the mural or changing the decor without destroying
the work.
Also, the media (canvas like vrs hard wall) will likely be more
familliar to you.
Good luck!
--
be safe,
flip
^___^
\^.^/
==u==