Re: Computing power...
Of course, one might try using a Raspberry Pi for the computing, as it has close to the same power as an original VAX.
Eh, I don't think so. The 11/780 had a clock speed of 5MHz (actually 'cycle speed', 200ns). The slowest RasPi still has a clock speed at least 100 times faster, and while the VAX is a CISC machine, with some of those single instructions doing *a lot* that a RISC processor like ARM needs several tens of instructions for to perform the same action, those VAX instructions weren't just a single cycle either.
Even a RasPi running SIMH is way faster than the same code run on one of the early VAXen.