I have experience with companies doing their own chips. Often as not what seems like a good idea turns out not to be because your volume is low and your ability

I have experience with companies doing their own chips. Often as not what seems like a good idea turns out not to be because your volume is low and your ability to get to high yield dominates and that both takes years and talent. As a rule companies should only do their own chips if they are certain they can solve and overcome the cogs problems that low yield and low volume penalties entail. If not you are almost certainly better off just eating the vendor margin. It is very very unlikely that you will do better.