First of all, the 24 length can be hemmed with that material... no problem. It's not as difficult as it looks, and any tailor could do it in no time.

As for the casual kilt, you can pick-up a light, medium or even heavy wool at many locations. Suggestions are with the Scottish/Irish shops that rent them out for weddings. I have three in my area that all sell handsewn, authentic traditional kilts for far less than new... and they're NICE! Try calling around to the Formal Rental stores for theirs, and whether they have them or not. Ask here on XMarks for someone that has outgrown one of theirs. I've had to toss seven of mine due to growth, and (gosh darn it) had to replace them with new ones.

Expect to pay for quality material and craftsmanship. It's worth the time to do the leg work in order not to be disappointed with the material or the outcome. I can get handsewn, traditional wool kilts in my area for the $200-$250 price range... which is half what it would be new. They'll also last longer than a couple years like some "lesser" kilts. This same place also has wool casuals for under $150. If you're willing to forego on a certain tartan, and go with what's available (but to your liking) than you're going to do well. It just takes work to find them in your area.

Nothing worth having is easy.