Andy,
If Uncle were here he would probably say
"What does this have to do with khukuris?
Everything!"
The one brick forge is pretty simple, and perfect for small forging work in the backyard. Get a soft firebrick (pottery suppliers usually have them). Bore a hole thru the end longwise. Bore a hole thru the side to meet the first hole. Put the metal in larger hole, and a propone torch (the higher end ones work better) in smaller hole. Flame on! Start hammering.
You can build a slightly larger forge from a few more firebricks, but the heat source limit how large it can be. If you look on the various knifemaking sites there are lots of forge plans, but this works pretty good if you are only making small stuff. I believe it's based on the book "The $50 Knife Shop" (mine is anyway), which has plans for several different setups. There's also a book called "The Complete Modern Blacksmith" with several forge setups - that book is more geared towards toolmaking, but has good general info.
Khukuri Content:
I have used the one brick forge setup in the past to harden a chakma. If you look WAY back in the archives, you may find a post on it.
Pat