Empirical data to follow, my insinuations are base on sound theoretical physics. Every major performance manufacturer in the motorsports world employees the principle of reducing component weight when exposed to the elements of inertia. If you have evidence to the contrary, I'm all ears.
Do a search based on the simple query of lightening the valve train and a flood of information will be at your fingertips.
The question is not if, but how much! I have designed and assembled a group of components of world class quality, that, I am certain of, thank you for your comments and concerns.
I would not disagree that, in theory, your modifications make sense. My inquiry was not a criticism, it was a serious question. Performance products for M116/117 are few and far between and your products will be well-received if marketed correctly.
If you are making claims of improved performance and better gas mileage, you need to be able to support them with actual statistics.
How is a prospective buyer to evaluate your product? For instance, if your modifications produce an extra 15 horsepower on an M117.961 engine I might be interested. If it's 2 HP, maybe not. A vague claim of performance improvement won't sell most people. The question is...how much will it improve their performance?
Perhaps some people are willing to buy performance parts based upon theory alone. But, I think most want to -know- what kind of extra performance they will get for their money. After all, the cost of your product is the smallest expense with this type of upgrade. Labor to install will be 2-3x the cost of the parts.
Best wishes on bringing your product to market. There is a space for it.