Just thought i would mention this here as a few from the Aussie forums have bought and built Homepins WPC MPU kits.
I personally have built two of them and they are pretty straight forward if you have some soldering experience. For someone who has no idea about measuring resistance or checking diode orientation and has done very little soldering, this is probably not the project for you. However, if you take your time and be methodical there should be no problems.
The board is labelled pretty well and there are some assembly notes on his website.
Here are a couple of pics of a Twilight Zone i have just restored and had the Homepin MPU board running in it with no issues - i also have had one in a Dr Who running for the last 6 months.
Because of our poxy Australian $, you guys end up getting them a fair bit cheaper - they are $160 plus $35 postage in Aussie $, so that prob brings it back to around $160 or even a little cheaper in US $ including postage.
Anyway, just a heads up for anyone like me who enjoys tinkering and building their own boards.
More details on his website