I've built quite a few lazyjacks using 1/8" Amsteel with no blocks except for a couple of cheeks on the mast. They are easily deployed and when not being used, bundle up to the mast so they are out of the way.
If interested, pm me with an email address and I'll send a sketch along.
It's nice to see another rigger around these parts.
I make my lazy jack systems either from 1/4" or 5/16" double braid dacron.
I've never seen any reason to make them from hi tech line.
Depending on the size of the boat, I will make a three, four or five drop system.
I use the "halyard" or "adjustable" portion of the system for the forward most drop. The "halyard is made long enough so that it can be eased so that the system can be retracted to lay along the boom and mast. Usually the retracted system can be hooked under the winches or reef hooks. No sail cover modification need be made.
I will usually splice the eyes around stainless steel or nylon thimbles. I choose thimbles that are small enough that the diameter of the line prevents the thimble from being able to contact the sail. Should they be left deployed. Sometimes I will just seize the line around the thimble if the line is particularly difficult to splice. A proper seizing is plenty strong enough.
Whenever possible, I will attach the lazy jacks to the bottom of the spreaders. About a foot out from the mast. This gives you a vee that allows the headboard and battens a little more room than using cheek blocks attached to the mast.
There are instances where it's not a good idea to use the spreader but usually it's no problem. You don't want to be supporting the weight of the boom with them anyway.
For the drops, I usually use a single eye strap fastened to the bottom of the boom and passing the lines under the boom, I tie one side to the other using a carefully adjusted clove hitch. That way the lines always pull on each other rather than pulling on the eye strap.
For the "halyard" drop, I will usually use a pair of small plastic horn cleats attached on either side of the boom about two feet aft of the gooseneck.
I hope that all makes sense. I just made and installed a four drop system Thursday. I can take a couple of pictures of it on Monday if anyone wants.