I have already done some dimension checking with Andy. My sump is about 40mm below the bottom rails. The objects that cause clearance problems with the engine at that height are the cam covers (only at the front for about 120mm) the fuel regulator and the breather pipe at the back of the cam covers. The engine lifting eye at the front also gets in the way. From the measurements Andy gave me there is sufficient clearance for all those bits. I will be trying it out within the next week - 10 days and will report back but it all seems to be ok from what I know so far. I reckon it will look pretty decent too
Hope that helps.
Enoch.