The problem is The Minifish is narrower than the laser so a strap down the middle maybe too close to the deck edge you are hiking from. If you still want to go that route all you need is a couple of inspection ports to thru bolt the hiking strap plates.
Might depend where you are as the mast cannot be shipped. I have had several of these rigs and have either sold with a Sunfish including both standard and SSF parts. I am in New England. Best value if sail is in good shape (no rips or repairs) might be a couple hundred dollars.
I have the aluminum trim for a complete boat include cockpit. $100 for all pieces. They are currently full length. If you need shipping they would have to be cut down to shorter lengths.
I also have shorter pieces available so let me know what length you need. $2.50 per foot.
Contact me at...
I have three brand new class legal upper masts for sale in Rhode Island. Contact me at email@example.com.
Each are $150 or buy all three for $400.
I also have new class legal booms available.
Will post photos later from computer.