One thing to keep in mind. Copper is measured 2 different ways. Plumbing is inside dia. (ID) Refrigeration is outside dia. (OD) So its usually 1/8 difference. Example would be , 1/2 plumbing copper is actually 5/8 OD. Just keep this in mind when buying fittings.
Also, be careful of different metals. Use brass between copper and steel. Steel to copper will cause electrolysis.
Good luck, and I look forward to seeing your results! May try the same myself.