After posting
Minecraft In-Game C# REPL I was curious on how it worked, so I quickly created a local clone of the
https://github.com/SirCmpwn/PartyCraft repo and opened up the main Solution file in VisualStudio 2010.
PartiCraft has a couple Submodules, so the VisualStudio load process had a couple missing projects.
The problem is that after updating the two required submodules, the project references/paths where still wrong.
The fixes where easy (path changes and re-adding the references) which when done allowed the C# based Minecraft server to fire up ok.
But this meant that my local clone was out of sync with GitHub, and since I din't have push privileges into the main PartyCraft repo, I needed to push my changes into my own fork.