I am very happy for you! My concern would be the your stickers for scapbooking. Would the heat effect them? I think it is awesome, it would be like having your own little gettaway. Everyone needs their own little retreat! Especially living with your son and his family, which I'm sure you love very much, but it will be nice to have your own space.

I have a 12 X 20 storage that we bought from a rent to own company. It was a used one that had been turned back in. It already had insulation in it but no dry wall. I didn't have the money for dry wall so we went to a gun shop that gave shooting lessons and they saved me the cardboard targets that was used. I stapled them oven the walls. Don't look good but it covered the insulation. My daughter in law gave me some commercial tiles that was left over from a job she did and she laid the down for me. My husband did the wiring for me. It's still not finished but it works for now.
Sorry about the double image.
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This image shows the cardboard. I like being able to use straight pins to hold up my sample blocks.

Some discount dollar stores have moisture absorbers with charcoal an silica. A couple of those will help absorb moisture and keep fabric from getting moldy. Just put them into the bins or leave them on shelves. I like the clear bins also. Maybe you can find a couple bureaus at a garage sale or thrift shop and put a piece of 1/2" plywood on top for your cutting table. Anxious to see photos.

I would be sure that all the little places that bugs and mice can get in are sealed up!

looks like alot of room for a design wall and to hang some of your work....making pretty walls. I bought a flannel backed tablecloth for $1 at a yardsale for my design wall. I agree with tessagin....those moisture absorbers are great...they really pull out the moisture from the air.

I like it. I am going to be some vinyl and put down on the floor. Eventually I will insulate and put dry wall but can't afford it right now and also get it wired. Thanks for your pictures

Sounds like you have a great space to create in. I would have heat and air in there to keep everything in good shape. You don't have to heat it to be warm just to keep things dry. Have lots of fun, you are very lucky.