Hi Stonebrain,
That looks like a really good idea, but a couple of things you might try !!
First, fibreglass mat is great for building thickness, but very poor for strength. However, if you use one layer of cloth first, then mat, then one more layer of cloth -- the strength will be much better,, (I would only use cloth)
A tool for working out air bubbles, is available from fibreglass suppliers -- it looks like many washers, spaced apart, but is actually a machined aluminum "wheel" pulled back and forth across the material -- available from -- "Aircraft spruce and specialties", in Los Angeles, California -- just punch in Aircraft spruce, on the web...But, if you use cloth, you probably won,t need one...
As mentioned, use paste wax for a mold relese, but let each coat of wax "dry", for at least 4 hours, between coats, and use 3 to 4 coats !!
BIG suggestion -- don,t work resin in sunlite, do it in the shade and you will enjoy much longer working time -- use a little less catalist, when it,s warm weather and mix small batches as large batches "Exatherm", and can get so hot it can smoke and burn !!
One other thing -- use "bonding resin", not finishing resin --as you can add another layer of cloth, even after the bonding resin has cured -- but, finishing resin, has a wax in it and you have to sand, between coats.
Hope thes suggestions are helpfull -- Bill H..