For me a steel arch building was a must..not cheap but mine is 35W x 60L x 18 T= 2100 sqft. i have seen way to many wood shops burn down. mine can handle high winds,snow and as i am way out in the forrest far less likely to go up in a forrest fire. I find it muffle noise to the point if your 12 feet away i have a hard time hearing you.being so big all i except in winter is my wood stove to take the nip out of the air and a forge helps out also. in summer i use big fans and that helps.i do not like to mix mediums (arts+crafts/contaminate )=mix wood with grinding and other mediums.( do blade+blacksmithing,damascus,pottery,leather,stain glass,mokume-gane and jewelry plus other things), so on on side i built three 10'x10' rooms with 2" x 6" so i can insulate.and the 300 sqft above i use for storage a big plus. i am in the process of building two 14' x 14' rooms these will add 392 sqft also for either more rooms or storage ,one for a office and the other as a fine finishing rooms. i will use window ac units where needed. my floor is 4" concrete with rebar., I took a great idea from a local friend doug merkel of suger grove nc a master blacksmith. I had like he did a 15' x 20' no concrete forging pit and for the floor vs dirt i use crushed tn blue stone for if i forge and drop anything it will not shatter on the crushed stone and it is great standing on vs back killing concrete. i have only a small back door and a big aircraft sliding door in front so for the most part is very secure.i left enough space between rooms on both sides so i can get later heavy machinery in as i find more $. this was not done over night but as i get $$ .Alot of thought has gone into this and it paid off.