Sluggo, you would have to understand my shop, first it was built as a big toy box that was not to be heated, if it were I would have done in slab radiant and insulated it all well including perimeter walls, The wood is all Boise Cascade laminated products that were hauled home from my job where I delivered those products to job sites, if they were refused for any reason, it was company policy to destroy the product. I had 7 tractor trailer loads on my back yard at one time, we used the I joists standing up as walls so insulating it would not have been easy, we wrapped it all with a layer of lumber wrap inside and out, sheet rocked and vinyl sided it then hung everything you can imagine on the walls. Was it the right way to go for everybody, Heck no but I ended up with a shop that my friends and I can feel confident that when we need to repair or fabricate something we can do it ourselves, they all typically help with the processing of the wood, watch the stove when I'm gone etc etc. Did I mention how much that shop cost me to put up, I have about $12,000 dollars into the concrete, siding, shingles and wiring, everything else for materials was donated, I as well as my friends are pretty happy with it over the past 15 years, Oh and I almost forgot to tell you about the second floor, we have 2 pool tables set up there that I do pretty well on $. I'm 52 years old, IF I ever build another shop, I can hopefully afford to do it the right way but for now, what I have works very well, perhaps not efficient but Definitely very effective!