Attached is a piccy for the final board layout. Comments appreciated which I'll try to accomodate.
So, we have an RJ11 connector for the Atari connection. I did this as it aids easy connection for external units as we can use an RJ11 to RJ11 cable. Additionally an RJ11 to RJ11 cable can be cut and made into two cables for internal connection with the keyboard connector fitted to the cut end.
We have 2row 5way headers for the CAN, Joystick 0, Joystick 1 and LCD connections. So ordering quantites of those keeps costs down. Then for the 5V fan and thermistor are attached to the board through a 1row 2way header (just like a jumper), so longer leads can be easily attached or detached.
NOTE: The fan on the schematics from Didier show a 12V Fan that you'd have to get the 12V from the PSU. Whereas I've seen many 5V fans only draw 0.2A which should be fine from the keyboard port. Still yet to test. But even so, if you still wanted a 12V fan, then only one of the pins need be used and you could still drive a 12V fan, as the other pin is 5V.
The JP3/SW2 and JP2/SW1 jumpers are to select CAN/Coldfire and Atari operation.
The termperture sensor works, and so I've just got to test the joystick ports & fan next, so after initial costings I think we're even under the £30 per board mark.
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Falcon CT60, Falcon CT63 x2, TT x3, MegaST x2, MegaSTE x2, STFM x2, STE x2, STacy, STBook, (Dead) Hades 060, Milan 060, T40.