It might just be a canvas built up......beautiful paint job and nice rims. Forks look like felts as well. Sorry no tellin as it could be one of many models that used that frame but it does look older than a Slater.
I think I saw this bike in the felt bikes thread on ratrodbikes. If memory serves me well it is a canvas frame and does look just like a felt fork, the wheels are from here: http://www.choppersus.com/store/category/3/82/Custom-Super-Fat-Wheels/
The same place has some different triple tree forks.
I have this fork on a Felt MP. they look cool and are fine but on a bumpy road you miss not having some form of suspension.
that bike looks killer beautiful build ...i believe a place like classic -cycle's.de have wheels and the tree's as you call them in store ... a big engine at that in this bike ...nice ride a ...