Originally Posted by Vilpich
I'll lend a hand where I can, although my experience has largely been 4e independent.
I'd also like to raise the legal question. 4e's SRD was much more restricted than 3.5's, so a lot of basic mechanics might have to be redesigned (or at the very least renamed) in the interest of copyright.
The game will not be a carbon copy of Fourth Edition, but a loving imitation with many differences. Not Fourth Edition's "Pathfinder", but Fourth Edition's "True20".