I got 40 magnets at Hobbytown for $6.
I took me a few minutes to cut some small locking washers up for the metal. I tested the strength by placing tape over the bottom to hold the metal in place before final superglue.
Hardest part are the CV’s that are not open on the bottom (drill). (Total time about 15 min for the two sets so far).
I was wondering if anyone had any better ideas for the CV’s that must be cut open on the bottom of the hull.