Steadman,

The spars can be cut with a fine toothed hack saw blade. Put some tape around the spar before cutting to reduce splintering.

I've plugged the ends with solid fiberglass or solid carbon fiber rods and glued them in with super glue (aka ca glue). Epoxy would also work. For that matter almost any glue would probably work.

Glue and rods and a whole bunch of other stuff can be bought at Kitebuilder. Here's a link:

http://www.kitebuilder.com/catalog/produ...e59ecbaea89e211

The nylon barbed plumbing fittings are sold in the plumbing section. Their intended use is for connecting flexible tubing. The tubing is slipped over the barbed ends of the fittings. My favorite is the 1/2" black nylon T. Here's a link:

http://www.mcmaster.com/#barbed-tube-fittings/=eybi3b

Best of luck on your project. With a little experience I think you'll find that it is pretty easy to put together a frame.
dj2