I know these aren't blue prints, but there are some pretty cool pictures that you can download for free and have printed.
http://www.trilon.com/bapom/posters-largeformat.htm
I had a similar access issue for some shelves I built and ended up using coated canvas drop sheets intended for painting as curtains to keep stuff hidden and reduce dust build up. They've worked great and being coated they are somewhat stiff and don't move around too much.
You're right, the 50,000btuh is the amount of heat needed during the coldest hours to maintain the indoor temperature you used in your calculations.
To figure out the cost of the heat, you need to determine how much heat is used in a year. To do that there are values called Heating Degree...
The outdoor design conditions for Salmon Arm, (as close as I could find to Sorrento) are -23C (-10F) most units will still work down to that temperature although yes their output will be limited. What can also be done is to use a heat pump to give you cooling in the summer and to provide your...
I saw a thread here the other that had a post with a nice detail for the approach slab at the garage door to prevent water entering under the door. I have searched and searched and have had no luck. Hopefully someone else will knows what I am talking about and will be able to post this pictures...