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@Archie's_Grobags
His theory is sound...there's none of this 'having to overcome the big gear' because the transition from pedalling forwards to pedalling backwards instantly cancels out the big gear...only one freewheel is ever driving at once.
The ratios turning at different rates also makes no difference because the freewheel that isn't driving is simply coasting along.
In theory, the fact that he's using two freewheels does infact mean that he will have a big gear for driving and a smaller gear for resisting.
The only problems i see are the strength of the freewheel pawls...finding freewheels with fast enough engagement to limit the spongy feel...being able to get both chains tight...and the constant freewheel noise (which can normally be eliminated by packing with grease.
As for the pedal thread loosening on a drive side crank run on the non drive side...i ran left hand drive profile cranks on the right side of my brooklyn race link for months with no problem....if you're worried, just use a bit of thread lock...although you will need to buy two sets of identical pedals so you can switch one right axle into one left body.