I have old Unicorn A-cat with heavy aluminum mast.
After trying to dead rising mast a few times(no fun at all) I invented completely "new" way of rasing a mast.
1. Flip the boat (platform) on it's side. (Bring it on the beach first). You will need some kind of stick to hang the boat on.
2. Position mast on the ground perpendecular to the boat.
3.Connect "lower" shrouds and stays. (I mean connect wires to the hull next to the ground)
4. Hang the mast on the ball and let the boat rest on the mast(remove stick)
5. Connect "upper" wires(you will need something to stand on).
6.Lift a boat.

It can be done solo with drinking beer in process. Despite boat lifting the process much easier and secure than wrestling mast up.

My 2 cents

Vlad
Inter 17R
Unicorn A-cat