Mate, you can get the glycerine from any super market, you will find it in the baking section. As for the tannin, just brew up a strong cup of tea, minus the milk and sugar.
Hope everything goes well for you mate. Unfotunatly with everything thats going on at the moment i wont be able to get there. But i wish you and Anne all the best.
Dave
I agree with Adrian on this one, holes for hops and slots for grain.
When i made my tun, i used a dremel to cut the slots. It only took about half an hourand around 10 cutting disks.