PE rewrite toolkit?

[amadmonk]

Anyone know of a good PE-rewriter toolkit?

I'm mostly looking for some/all of the following capabilities:

• Metamorphism (juggle the code by inserting nops/mov edi,edi/etc.)
• Function reordering (not as simple as it seems due to relative offsets)

I could probably write some of this myself, but my recent explorations of ManualMap have made me gunshy about PE manipulation beyond the export/import tables.

I know virus writers have some toolkits floating around, but I can't for the life of me find them. A good metamorphic toolkit alone would make hashing your code almost useless.