You can try a halfer meshmod by throwing some enkmat over the existing pinwheel without shaving off any of the other pins if you want to do a 'test run' prior to a full on commitment.

As far as adding a bubble plate goes, you might as well pick up one of these:

http://www.vertexaquaristik.com/prod...ies/in-180.php

Would be ten times easier than buying and machining the acrylic then cutting open the body to get it nestled in there.







*In the best interest of full disclosure, I should probably mention that I work for the distributor of BK's and Vertex...

Yeah, they have those at the LFS, but that would really take the fun out of it :)