You will lose to the competition due to higher costs and inefficiency every time if your quality and capital productivity is low. They were often obtaining components at lower prices than Toyota was.
For the freedom to modify your vehicle as you please, you may want to consider financing. I often ask people the following question. Chiharu was quite amused to point out that all such visiting parties tended to come away with superficial views about how Toyota really operates at the detailed level.
Toyota makes it engines internally but it is done again in a very smart fashion. It can go in circles or in a loop or in a straight line. We can state with some scientific certainty that smoking is a leading cause of cancer for example.