05 frame on 06 etek yep indeedy.
Yes I have just registered, but have never had a reason to post before
Just finished this afternoon fitting an 05 frame (stock not star) to my Etek
Will post pics later but you need to machine the frame to accept the extra aluminium on the body where the reg mount fits.
Also you need to ramp the channel where the barb and airline running from the reg mount to the solenoid sit.
And drill a new hole for the frame screw and modify the top of trigger guard so bolt sits flat.
All in all not that hard its just time consuming.