Greg,
You are a fast builder man.... you must really be hot on the heels to get this one done....
At any rate.... As far as I know and according to their sheets, K36 indeed can be used as a primer by itself but has two disadvantages:
1) It does not have the sealing properties of the DPLF primer/sealer.
2) If you sand it too thin, the paint may lift.
Something to think about, but if I were you I would use 2 qts of the DPLF stuff and forget about it. According to the instruction sheet that I am following, the guy wants you to use DPLF epoxy primer to seal the fiberglass and any other substances that may have been used. That guarantees a clean board for the K36 step.
And yes... I'd say $1000 is about right for all the materials. Have fun. Spraying K36 and Block sanding is a lot of fun. That's when you really get to know the body real well.
Jose Borja.