Hi,

The pics look good, from what I can see. Are you using any guides for the kilt making process?
As for straps, a cheap way to do it is to go to the salvation Army/Goodwill/local thrift store with clothing. I got some good quality leather belts with appropriate buckles for $2 each. I use one one right side. On the left, I started doing what I thought was unique, but is exactly what our Tartan and kilt history scholar Matt Newsome does. I put the strap and buckle on the INSIDE of the kilt.

(From Matt's website)
On my personal kits, I use a nylon webing material with the "button" style latch. Officially called a "center release buckle" for 1" webbing strap. The result is strong, secure, thin (more comfortable), and VERY easy to use, while still looking "not modern" (if not exactly traditional with 1 visible strap and buckle). WHY? Because the strap and buckle digs into my hip/rear hip area, while the button/nylon doesn't.
Dritz item # 475

Not exactly a Cavscout special kilt strap (what I plan to use in the future).
http://www.oconeeleatherworks.com/MiscAcces.htm
BUT, the webbing/button buckle/cut down thrift belt is quite good in bang for the buck.