Since It looks like Jensen is familiar with the stand alone boiler, I'll just ask for the plug-in setup. I have a 55 that's been sitting on the shelf for two years patiently waiting for a rebuild, so I think I'll finally do that this weekend and see if I need parts (unlikely) and then call Jensen next week.
The boiler sounds expensive until you start pricing around. Even kit boilers aren't cheap. The 3" should do for all the casting kits I have in the stash right now and it will take me several years to machine them all.