I almost bought the plans and laser parts last year. I too built Pat's DC-6 as a C-118 and then built a sized up 80" C-118 which I still fly today. My 80" C-118 is only 5 lbs AUW and uses four 450 size motors and one 3S 3800. I also have Pat's plans for a 75" B-17.
I do want to build the Orion though. I was thinking of developing a set of plugs to make some vac formed or possibly fiberglass parts. The nacelles look just like several other heavy lifting military planes (T-56 nacelle). Sparky has several sizes of these but I think the size you need is not one of them.
At 8-10 lbs I would guess you need about 1Kw. Maybe four .10 size electrics. I used the E-Flite retracts in my big DC-6 and they have been perfect.
Looking forward to watching this one go together.