Request: Inboard H-2 engine

[JacobB094]

Sorry for spamming these, but I took a break from Titan to work on some Saturns, and things come up in the docs. Would that be possible to make an inboard variant of the H-2 engine? It was proposed in several Saturn studies as a replacement for H-1 on larger Saturn configurations, and it stands to reason that it would have been configured as inboard and outboard just like the H-1.

To avoid switcher clutter, perhaps independent switchers for C/D variant (or, presumably, H-2A and B) could be implemented? I don't know if that's feasible, given the model setup and B9PS limitations. If not, this could go to extras.