Years ago the Mechanical Engineer at the company we worked for was lamenting that the most recent "custom" design had reached the upper limit of available components. He explained how anything bigger would require advancements in technology not available at that time. The salesman who happened to be in the room at the time looked at the two of us, shook his head and said "If we can sell it, we can build it". There was never a doubt that he truly believed that.