Hi,

You can find the cross view of FP1 spindle here: http://www.usinages.com/manuels-docu...fp1-t3738.html page 55 of the documentation (sorry in french).

Still in french, if you look at this thread: http://www.usinages.com/conception-f...xy-t15107.html the guy build a spindle very close from Deckel spindle (and he got one FP3, no wonder why).
His spindle is made from 42CD4 (no post treatment), BT40 spindle nose (done on an asian lathe), Needle bearing in front, runing on a bearing ring (NKI bearing), double angular bearing (normal SKF) on top.
The trick to have low radial clearance is to use the fact that needle bearing race is thin, so a very tigh adjustement make the race growing, or shrinking. In fact in his case the adjustement is a little bit on the high side. He explain me that Deckel use a wide range of needle, spaced in micron, to found the correct adjustement when building or refitting a spindle (he used to work a lot with Deckel in his professional life). There is also some growable needle bearing (INA), but more exotic.
Btw, all his epoxy granit mill has been done with pure DIY spirit: no big machines (not even his FP3, which he doesn't have at first), no exotic component. I have seen it IRL and it's pretty impressive.