I would also like to see where the TTB says the 60 day window. I talked to them on the phone and was told that I needed to have everything in place before I could apply. Saving 2 months would be great.
UPDATE: Just got off the phone with the TTB. They say that in order to file your DSP you must:
1. Have a premises that can be secured under 27 CFR
2. Have an invoice or purchase order showing all necessary equipment
3. A diagram showing where all equipment will go inside the bonded premises.
So, you don't technically need a still, you just need to have ordered one.