You have to create an account to gain access to the message board. Once inside you'll notice a section titled Leader Tapering and Peg Positioning Calculator. The first thread in that section has an MS Excel file that allows you to easily plan a properly constructed leader.
I've been furling for a couple of years now. I also prefer the mono leaders to thread. Mostly due to the cost. Uni-thread is expensive! I use 1,2, and 4lb mono mostly. Ice fishing line usually goes on clearance after the winter, so you can pick some up for a dollar or two per spool. I can get two full leaders out of one 110yd spool, but I'm going to adjust my peg board and try some new wrapping patterns this year to squeeze out one more. Ice fishing lines come in some cool colors too! Red, royal blue, and silver are a few colors that I have in my collection.
The clear mono sewing thread you find in craft stores like Michael's or Jo-Anne's is about 1lb test and its, (wait for it) CHEAP. (I'm a cheap guy, what can I say?) It comes in clear and smoke gray. You can mix and match this stuff with the ice fishing lines to make a two-tone leader or keep it all one color.
Once you get your rhythm down, you can make a leader in about 10 mins. Just as fast, if not faster, than knotted leaders.