I answered a PM asking a few further questions.
In case anyone else had the same questions, here's what I wrote.
I'll take a few pictures and post them to the same thread when I get to work on Monday. I have never figured out how to attach photos to PM's.
I usually use some adhesive lined heat shrink tubing over the seizing when I don't splice.
(On figuring out the lengths)
Don't over think the process.
On a three drop system, you want the eye on the "halyard" drop to be as high as is practical. Close to the spreader.
The way I usually do it is to mock it up on the boat.
Make up a "mock" system by tying bowlines, using a piece long enough to serve as the "halyard" drop, around a piece of old line long enough to reach from the spreaders to the two after most positions on the boom, doubled, . Then just throw the "halyard" drop over the spreaders from the deck. Set it up and then carefully retract the system. Tie some knots or apply some black tape at the appropriate spots and you have your lengths. Make the halyard a little long if you're in doubt.