Wow! It will be such a comfort to you, as you work on your shop, to remember your sister. I am glad your dad can help a little. Just keep plugging away, and working towards your goal!
Let us know where your shop is, and maybe others here on the board are close, and could come help clean up, etc.
As things shape up, perhaps your hubby will see the dream too, or at least be willing to give a hand and some emotional support. He may think it is "woman's work" to quilt. Has he seen this board, and the great number of MEN who quilt? He can see by their profile pics - these are MEN, real MEN. And John Flynn was an engineer. I am sure there are many such stories.
Good luck, hang in there. You are LIVING what some of us only dream of. Don't give up!