Great Willib,
And all looking well -- those arrow shafts are really stiff and from reading your post, I see the foam is probably what we used to call "Urithane foam"..
Just have a couple of suggestions for you, and one BIG caution !!
When "glueing the stacks together -- try to keep the glue away from the outside edges -- as if the glue reaches the outside edges where you will be sanding-- it will change the consisitancy of the foam --(hard and soft spots) It,s also helpful to use a "backing"board, with your paper attached, or you wind up with big scallops in the finished product!! (hope that makes sense!)
The "BIG Caution", is -- some forms of foam can be hot wire cut, as someone suggested --BUT, if I remember correctly -- Polyurithane, forms a rather dangerous and toxic gas, when hot wired -- so be very careful, when hot wireing some types of foam!!!! It works really well, and I have used aircraft, stainless steel safety wire, for the wire -- it works well and I have used a 12 volt battery charger for the power to heat the wire -- getting the heat correct, takes some practice !!
If you need more info on that, email me.....
When glueing foam together, I thicken the resin, with glass beads -- so it dosen,t run all over (available from fiberglass suppliers or Aircraft spruce Co..)
Other than that, and as you mentioned -- wear a filter mask, as that foam dust can really cause you health problems...
Hope this is helpful, Bill H........