Hi Mike,
Good to see a fellow flyer on the forum. I'm sure you know this already but Chris Williams writes a good 'big glider' column in QEFI magazine. Once you cnc cut parts from CAD designs there's no going back to carbon paper and all those hand methods!

Hi Jonathan,
Good point you make about the rail itself deflecting - I was think only of the block itself which is of course open to allow the supported rail underneath. That makes things more complicated and either needs FE, or someone to do a quick test!
If you've never flown a model heli before then join a club and get trained because otherwise you will crash it in seconds! Lots of PC simulators out there which are worth a go because you can often connect your own Transmitter (using the buddy lead).