With only 8KW you'll be a bit tight for running a number of OSes / tests. For example, you'll need to run XXDP+ rather than the later versions. Even then some tests will require more memory (e.g. ZQMCG2). A Unibone would be a great option for expanding memory, if you can swing it.
Feel free to reach out if you have problems with your MM11-L. I'm in the midst of repairing my 5th one.
Building a Unibone can be very useful for such a system to expand the memory and run RT11. And it can be a great help with debugging. The 11/05 serial port is a current loop or TTL. Not RS232. So maybe this project can be helpful.