I want to thank those who suggested getting the service manual from Dell. I've got it and it is really going to be helpful as the disassembly process is a lot like I expected but not quite so it should save a lot of headaches later on and the likelihood of damage is much less.
I expect this will run debian jessie with enough memory for reasonable projects. The memory modules should be here in a few days and then it's time to make it happen. Martin McCormick WB5AGZ