Lots of good advice here. Here's my 2 pennies. If you want a 64" bow, go with a shorter riser. A 12" or 13" will give you plenty of working limb. Also you can use fewer lams to get your stack thickness, it's a lot easier to keep 2 lams from sliding around during glue up than 4. If you are not making a reverse handle or using clear glass, you don't need to run a lam up the riser ramp, also makes things easier. You should not need 8oz of epoxy, unless you like the cool shapes it makes when it squeezes out. 4oz should be more than enough if you apply it judiciously. I don't think I have ever mixed more than 100grms and always end up with a little left over. I think most folks use some kind of spreader for applying the epoxy, but I have found that I waste less using a cheap 1" chip brush with the bristles cut back and never get dry spots because you really have to beat it into the surface with a brush.