Re-Basing Metal Heavy Weapon crews

The rumors of Heavy Weapon crews having 2 wounds on one 60mm base had me a little concerned. Would it me a big deal if I were to show up with my old Mordian gun crews with seperate weapons. At my local game store, noone would think twice about me keeping my guys old school. But then there is that perfectionist in me that rears it's ugly head every once in a while.

I did some pricing online for the 60mm bases and saw GW was selling 3 for $4.50!?!?
These are bases right? So when I popped my head into the local game store and saw a 15 pack for $5, I couldn't buy them fast enough.

Now that I has the bases, I was ready. Then I had an idea...what if I were to make each 60mm base like a mini dispaly piece with the cut out positions for the crews. That way I could remove one of the crew when the base took a wound, and leave my guys on the current round bases they already had. I found some Plumbers Epoxy...think greenstuff, that you can't sculpt only a lot cheaper...rock hard in about 20 min and takes paint pretty well. Anyway...here is the Lascannon rebased.