Rich,
The lever frame does detract from the layout. I can understand where you are coming from, and for a personal non-exhibited layout putting the frame where you have it would be ideal, but for an exhibited layout I do feel that it just seems in the way.
I did notice the lever frame on Jerry's Tucking Mill at the AGM and decided that "I want one of those", and I think Jerry's siting of it is best as it is "off scene" as it were (and uses electronics to do the "controlly" bit). Obviously if you intend controlling the points and signals mechanically then siting it where you have makes a lot of sense, but I do think that unless you have a very low stool / kneel down then both you and it are going to be obtrusive :-)
From a number of levers point of view I think that the 10 you have should be sufficient as a few of the ones on the prototype would be to operate off-scene signals and facing point locks I would imagine (I assume that you won't be needing those to move in 2mm :-) ).
I look forward to seeing how this progresses though.
Ian