ORIGINAL: MarkShapiro
Len,
Removing the firewall is really not a difficult task at all. In fact, you will be unpleasantly surprised at how easy it breaks free from the fuselage. So really, two purposes are served by this operation: One, you broaden your engine selection choices and, Two, you do a far better job at securing the firewall into the fuselage than what was done at the factory.. Good luck.
I concur with Mark here. Even if you don't move the firewall you will probably want to reinforce it with some strips of glass or something. The firewall in my kit was loose and only stayed in place due to the glue fillets on either side of it!