Hey, uhh....
I dont want to butt in here, but would fostex really be a good choice for this?
Its nto the quality of fostex that im thinking of, but seeing as how we were FIGHTING the japanese during WWII, and it this is to be a "memorial" system for your grandfather, maybe using japanese made equipment would kinda.. i dunno.. seem improper???
Honestly, seeing as how he was in WWII, and built this during his time as a marine (thats the impression i got) it might be a little more proper to only use equipment from the Allies, and shy away from anything german or japanese.
I know you want this system to sound good, but there is supposed to be a statement behind this that is more important than sound...??
Then when somebody sees this retro style system, you can show them that this is an amplifier built by your grandfather with all vintage gear from the allies of which your grandfather so proudly served in WWII
just my two cents...