Apologize for getting back to the forum late. Had very little sleep the last few days. It caught up to me. Fell to sleep approximately at midnight instead of the normal 2am to 3am that it has been. So, it was good to get some sleep.
I don't want to fill up the forum space with too much talk of this project out of respect to others. More pictures with descriptions of this as it progresses will be posted on "Miner Porn Photos" at
https://bitcointalk.org/index.php?topic=766998.60re: the metal bracing, I'm just wondering whether you ought to consider fitting a central vertical support pillar on those shelves as well (from top one down to floor)?
It's a consideration. After the horizontal support is completed we'll have a look at how it works and see. Here is the perforated steel 1-1/2" x 1-1/2" x 72" on the menu for horizontal support:
http://www.amazon.com/Steelworks-Boltmaster-11205-2x72-Tele/dp/B000BD5F7O/ref=sr_1_fkmr0_2?ie=UTF8&qid=1416060848&sr=8-2-fkmr0&keywords=H+Plated+Steel+Perforated+Square+Tube It would be cut to 43.5 inches to fit horizontally.
Two (2) of these 43.5 inch perforated square tubes
for each shelf. The same can be used for vertical support
if needed because it is 6 feet long. Prime and paint them white before installation.
There are two (2) 1"x 2" wood braces installed horizontally under each shelf at the moment except for the bottom shelf. They aren't doing too bad, considering the weight on them right now.

Also, is there any way that you could duct all that hot exhaust air around the building, instead of just into the garage? It would save on your heating bills in the winter and you could have a by-pass duct straight to the outside air for use in the summer (no need to run the aircon unit then).
That's exactly what Will be done soon. I have all kinds of 14 inch duct (90 degree elbows, two (2) Speedi-Products FD-25R8-14 14-Inch Diameter by
25-Feet Length
R8 Insulated Flexible Duct with Metalized Jacket, 26 gauge 14" in diameter "T" duct (one to tie into the existing duct and the other to feed outside through an exit duct with damper). All of this purchased through Amazon. Really don't mind the heat going into the garage at the moment. It seeps through the floors up into the house at the moment [Keeping out the wood flooring toasty to the feet in the bedrooms over the garage].
I appreciate that it's easier said than done and ducts aren't the nicest things to look at in living-rooms (perhaps you have ceiling and wall voids to hide them in), but it seems such a waste of valuable heat.
Actually the duct work would be above our head in the garage tied into the existing duct work that feeds all the vents in the house. It will be a lot easier than one might think. The duct work is already visible in the garage to the eyes. So it doesn't matter to me if it's seen or not. No duct work will be visible in the house. Using existing duct work to feed the heat to the house.