I’ve just got the alpha for this game and had a fun day playing through it.
One thing though; if you build a production unit and later want to replace it with specialised versions of that unit, you have to demolish it losing all of the investment that you’ve made into it.
Given that you cannot really make a profitable factory without making specialised units then the game isn’t “upgrade as you go” as I had hoped - you need those specialised units right from the start.
I’ve just made a profitable factory by building a couple of research units and leaving it run (while I went off and walked the dog) researching all of the specialised units before even starting to build a single car! Hopefully this isn’t what you intended for your game.
My (humble) opinion is that the game needs re-balancing so that the combined units can (more easily) make a profitable factory and there needs to be a sell rather than demolish so that when you upgrade to specialised units it’s nowhere near as expensive.