I was in the same boat, also. You may find other posts on this topic made by me... I've lost track of many of them.
The TechZone Huxley used 6mm and 1/4" parts. The smooth rods were 1/4", and modern bearings for 1/4" components are 4x-6x more expensive than those for 6mm smooth rod.
The TZ Huxley used skate bearing arrays, obsolete at the time it was sold. If you replace the 1/4" smooth rod with 6mm smooth rod, you can make a Huxley using modern sleeve bearings.
I have an unused controller board, still in the box. An ebay search will fish up a number of 25-35 dollar control boards that will do the same job, and be standard.
My Huxley was never completed. I finished the frame and, after reading within this forum, noticed that the other components were not up to standard. There are several contributors that have printed improvements/replacements for the TZ design. If I finish it, it will be with 6mm rod, sleeve bearings, and a new control board. I'll need to use my PrintrBot Simple to print re-designed parts.
Personally, I'd like to see a photo of KD0SKH's printer. -Phuzzy