This is a great link with a great parts list and sources. I am in the process of my build and doing the research I came up with this. Knowing that there are others on this forum on the same track, I thought I would share:gar-Bi
Link incomplete site, but Tom is a nice guy and will get back to you if you email him, adapter for a 3520B runs $89.00+S&H, but is easily removable and basically plug and play. Tom has some other nifty gadgets too.