Early layups seem to have been about the choice between unidirectional (not woven) pre-preg, woven layers and braided in a few cases, with a focus on creating something that doesn't break! Then the number and ordering of the graphite, fibre-glass and kevlar layers, following the knowledge that was built up making other products, became a differentiator. Then as the trend moved to larger frames, weight was reduced by lowering the number of layers and strategically reinforcing some points only, and adding dampening materials rather than full dampening layers or foam filling. What we have today is a continuation of that with the assistance of computer modelling to check the stresses and harmonics before baking anything. I guess the options regarding the type of materials and their costs are fairly well known in the industry today.