I have been reading and rereading this thread.
I am going to give this a try this year with 2 cassette's.
I started by picking 2 fully drawn deep frames and cutting the space needed for the cassette.
After mounting each in a frame, I put a coat of wax over the entire surface were the queen will be caged.
I then painted the top bars RED and numbered 1 & 2.
I installed them March 1st in the hives I would like to raise queens from.
We were very warm, some 80% days.
Then it got COLD and some snow.
Today I had time to check the strongest hive and the comb around the nicot cassette was full of caped to fresh laid eggs.
We are going to have a stretch of good weather so I thought why not.
I found the Queen on the next frame over so I placed her in the nicot cassette with the cover installed.
I will leave her alone till Sunday evening.
I will check the other hive tomorrow.