RDJeff, Great build so far! Did you simply locate the gear for the retracts in the same location on the plans as for the stock fixed gear and cut holes for the wheels and air lines?

Also, how is that box fan with the furnace filter working for you? is it keeping the sanding dust to a minimum?
Lastly, can you comment on your magnetic building surface(how's it build? dimensions? source for the metal top? etc)? That's pretty slick. Would love to have something like that!

Thanks,
Mark