You may well run into problems as Ian (MIH) has specifically stated on his website:
"The InCar-Pro firmware presented here implements one or more patents registered and/or owned by Scalextric and/or Hornby. The firmware provided here is done so free of charge, and may only be implemented on car chips manufactured by Scalextric / Hornby. It is a condition of use and review that this firmware is not used in any commercial manner whatsoever, and that no charge, payment or funds shall be made for the firmware itself. Individuals are permitted to charge only for their effort in loading of the firmware provided here onto original Scalextric chips".
"The InCar-Pro firmware presented here implements one or more patents registered and/or owned by Scalextric and/or Hornby. The firmware provided here is done so free of charge, and may only be implemented on car chips manufactured by Scalextric / Hornby. It is a condition of use and review that this firmware is not used in any commercial manner whatsoever, and that no charge, payment or funds shall be made for the firmware itself. Individuals are permitted to charge only for their effort in loading of the firmware provided here onto original Scalextric chips".