While a complete package is nice and ideal for us the OP will benefit financially from the separation. If someone, who has a 5150, want the 5161 they are willing to pay X amount of dollars. They are not suddenly going to pay Y dollars to get a system they don't want/need and have to sell later. The OP can post that she is parting out a complete system in her eBay listing and the system has been tested all together and works. Of course this is more hassle and head ache so it all depends on OPs initial goal.
I personally think she should tell her hubby to shove it, get a nice retro desk and pluck the whole thing down on it!
But thats me. I love messing with the old machines. She may not have the same "love".