Thats awesome!  I need to get better with solidworks so I can get this sort of stuff done.

WRT PVA coating your plugs.  I use PVA quite a lot on plugs.  I spray a several dust coats on first as I find that if you spray a full film first it fisheyes something cronic.  Once you have a full coverage with dust coats you can hang a full film coat onto it.  I use the blue gloss PVA so you can see if you have a full film and the gloss finish leaves the mould looking perfect.  Sometimes I even put a coat of wax over the PVA to ensure a good release but I'm sure this is overkill.

Thanks for the tip FLD, I'll be sure to do a couple of light dust coats for adhesion first before laying it down.

I was told that several alternating layers of wax and PVA can be used when complications are expected.