I have Hobbico mechanical mains and a Robart mechanical in the nose. I recommend making your mains longer then what the Pica plans show. If you build it per the plans you will have some prop clearance issues using a 10" prop on the 46's.

I moved my nacelles in one bay to reduce the engine separation, that reduced prop clearance even more. I ended up with less than 2" of prop clearance and one fatefull day shattered a prop on take off, but that's another story...

My new fuselage is just about finished and I have modified the wing with longer mains so I won't have the landing gear excuse next time. The longer gear will work better as I'm flying off grass now.

It's an awesome flying plane, I have TT pro 46s...can't wait to fly it again!!