Welcome to the forum Merv and Sharon. My Harrison is on the way too - what state are you based in? I've done a fair bit of research for the build and there is a whole lot more knowledge here on the forum, so ask away.
Sean Mullins makes a very nice aluminium tank for the Harrison if you're not using Warwick's. Classic and Vintage Light Bulbs in Adelaide can also supply lights/lenses at a reasonable price and the service is excellent.
http://www.classicandvintagebulbs.com/
Cheers,
Paul