I've gotten it compiling! Though I'm not as excited after just now noticing salamynder's comment:

https://raw.githubusercontent.com/gentoo-haskell/gentoo-hask...

I basically have the same modifications, though I use a StoreableArray instead of an IOArray so theirs is probably faster.

I'm very satisifed I was able to fix all of these things so easily thanks to following the types and using ghci.