Cheers! Going to have a good look when I can, get some progress made. Speaking of which...

Actual work has been done on HardWired 2!
Cad work, but I've got somewhere with it nonetheless!

http://i1355.photobucket.com/albums/...pse1b00311.jpg
http://i1355.photobucket.com/albums/...psb31671b6.png

140mm-ish OD, huge hole in the middle is for a 47mm OD roller bearing, but also have done a design that's been adjusted to take smaller and/or simpler ones because I don't have a great load of engineering expertise so the simpler the better! (He says, designing a single toothed spinner). Takes a 20mm dead shaft too, with the bearing being in the disc. The bulkheads are going to be bolted to the hardox chassis extensively, but a bit extra strength doesn't harm!

Centre of gravity somehow is spot-on, and it's been designed with 10mm hardox in mind as material, but I'm definitely considering upping that to 20. Rough calculations of weight come out at about 800/900g (with the bearing holders bolted on) which is admittedly a little on the light side but it'll probably help with spinup time. Failing that again, can double it to put it much closer to 2kg.

Still a bit of tweaking to do, but it's progress! Soon as I hear word back as to whether I've made it into the world champs, I'll get it all cut and whatnot.