Has anyone tried to build their own tmcc boards? seems that it could be done. You'd still have to use the Lionel receiver board but it seems like it would be less expensive making them your self. Any thoughts?
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Google Carl Tuveson to see his web page. See TMCC projects for S. then see one of his DIY TMCC projects. Have fun. 
Since you can buy the DCDR or ACDR for $20-30 with a little looking, it makes little sense to try to roll your own. As you say, you'd probably be using the R2LC anyway, which is what Carl Tuveson does in his design. Most of the functionality is on the R2LC receiver board, the lights, smoke, couplers, etc. are all controlled from this board. The DCDR just takes the PWM drive signals from the R2LC and generates the motor voltage.
You can buy the ERR AC or DC Commander for around $70 which includes the R2LC and the motor drive all in one package. For smaller installations, you can use the ERR Mini Commander.
