Ah, ha...!
Looks like we're working in tandem.
Alright Bob, you're on! Are you going to kit this for the rest of us?
The 40 has a 58.5" span. Do you need a plan? If so, send me a PM with your email address.
Before setting that 60 in stone though, we might want to reconsider scale. Anyone prefer a 6 footer over the 65"? I suspect the 72" would do very nicely on a strong pumped 61 or some 1600W.
David.