I have an idea for an engine I want to try and bring to life for a small production car company I want to try and create. This came from my original thought for a car with a 12v53 Detroit and after not being able to find the information I wanted I got to thinking about maybe being able to do better on my own, and so I thought about basically combining two 5.9 Cummins into one engine using standard rotating assembly parts, less the crank for obvious reasons, and change it from an overhead valve design to an overhead cam, I think for simplicity I'd go with a direct acting, dual overhead cam setup, since it's a large displacement diesel, torque won't be an issue and from what I know OHC engines tend to make somewhat more horsepower as compared to OHV engines, just look at a comporably sized LS and Coyote engine. I think common rail would be better for ease of building as it simplifies the valvetrain as compared to EUI and MUI, plus it allows me to use off the shelf 5.9 engine-side fuel system parts as long as I size them right, so there's reduced costs as well. My problem comes in with forced induction, I want to do a reverse flow head design since it'd be easier to package with an air-to-air intercooler as I can build more free-flowing intake manifolds for each head as compared to the stock manifolds for the Duramax. I think for more simple exhaust plumbing I'd want to build basically a turbocharger setup in the footprint of an 8v71 blower but then there's the question of boost managment and how to actually do this. I think my idea would be to have a separate intake and exhaust side like a traditional turbo, however I have basically two blower sections, the exhaust side is gear driven to the intake side. Because it'd basically be a Roots style blower setup would I need to worry about non-linear boost levels and therefore need some kind of wastegate? Or am I overthinking that and it wouldn't be necessary? Am I overthinking this whole thing and it wouldn't sell because no one would buy a car because it's such a weird idea and therefor an expensive idea?