Forged con rods in XUD.

[zx_volcane]

What costs were you getting back?
Which companies did you go to?
How many layers?

https://oshpark.com

Can you share the layout please ?
Got a BOM list ?

Does this cover all the power supply and all the sensors / FET's ?
Seem to recall your box having separate boards.

Would seem logical if doing a run to go for the raw Atmel rather than adding the costs of an Arduino board, no?

Well yes, it all got a bit complicated as I added more and more components and functionality to my design.

I included a power supply circuit and FETs, a MAP sensor, and power rails / inputs for the other sensors.

Just about squeezed on a 2 layer iirc

Last I got up to was a breakout board that needed a separate arduino, then looked into getting it all onto a shield, and yes finally it'd be good to just integrate the amtel and have a complete embedded system

In the end I figured it was much easier to just protoype on stripboard and stuff it in a project box with whatever connectors you want to use, as the end result is pretty much the same and you're not limited to design changes in the circuit.

BOM list I don't have, was specced up on the components im currently using on my prototype so could be alternatives. Also connectors ..etc ended up being what was in the design library, not what was available to buy or cheapest option.