I shall soon have one of these as well. Rich is a bud of mine and I collected all the parts and pieces after he gave me a list and sent me some of the basic parts. It's assembled, just trying to make sure the valve works properly before installing the level 10, and just need to adhere the rail.
Which parts specifically did you sand down on the underside of the rail? It seemed like it would fit well without much sanding to begin with.
"All that is gold does not glitter, Not all those who wander are lost;" My MCB Feedback