Got this idea from someone else on the LML.

http://www.highrf.com/gallery/Feb-06?page=2

Last 4 pictures (as of 2.9.06).  I'll cover the radials with 2 bid of some
really light glass that I have.  Backplate will be soldered with low temp
and some SMT flux to wick in a little solder around the edges, then the
nutplate will go on that back of all of that.  I'll drill and countersink a
screw from the bottom with a nut and star washer on the inside and run that
back to the central ground.  Same will happen on the transponder.  Altho it
will be 2" square approx.  Marker beacon will be harder and I'll give and
paint it on...

Should work a great.... I hope :) ( guess I'll put my antenna analyzer on it
when I'm done... It pays to have been a ham for 20+ years, it's amazing the
stuff you gather)

Alan