Pce to tg16 converter

Being that it's so hard to locate these things anymore I'm wanting to build my own. Anyone know where I can find the plans to build one. I'm not looking for plans to alter the TG16 inards, I want to make a card. I have the HuCard socket from a junk TG16 I have. Any help would be appreciated.
As far as I know, a PCE/TG16 adapter is just an extender that swaps some pins:

15 / 23

16 / 22

17 / 21

19 / 20

(assuming that pin 1 is the short pin, which is on the left if the card is in the usual orientation for being plugged into the system)

Hope this helps.
You can usually find one on eBay for around $50 if you look every 2 weeks or so. I think playthegames.com is planning on stocking new Kisado's sometime in the near future. They're a pretty good store, I've bought a few things from them and haven't had any problems.
Thanks guys. I appreciate your help. All I need now is to get my hands on a PCB.
What Xavier linked to is intended as an internal mod, but as far as I can tell there's really no reason that you can't use the same circuit on a PCB.