Yup! I have seen that one. The one I build will have to hold the weight of a 24"-28" Dob. So I'm sure there will be some teething prob's. And will need to determine the scopes weight before really going any further. I think the main problem will be driving it, and driving it smoothly so the motor doesn't introduce vibrations. I do have a few ideas on this but I'm yet to be in a possition to experiment. I have access to a graveyard of old cars and farm machinary, woodmill machinary...etc...etc... so a good deal of interesting bits to source and play with.
I'll wait until I have the 12" dob before I start to play. But have put a few things aside. The grave owner will be eventually sending it all off to the crusher. including my last car which still actually goes lol, mind you just barely after we played smash em up derby with it lol...
Amazing what you can do in an open paddock with Van Halen blasting away, not to mention the odd low laying stump ooooop's fergot about those
regards