Labor , that’s always the problem eh? ... Most “companies “ charge a high labor fee because usually half (or better) goes to the company (profit, overhead, taxes , insurance , etc. etc. ) ... then they double the price of the parts (more profit) ... Always results in a Large bill ... It’s ALL about the MONEY ...
Before everyone became so “Capitalist" (greedy) , they used to work on smaller percentages ... depending on long term and return customers ... and making a modest profit ... Now it’s all about “all the traffic will bear “ within the Market structure (comparable prices ) ...
I’ve always kept track of my hours and charged a reasonable rate , which is why I always have return customers/collectors , and am NOT in the 1% , and can sleep at night (conscience) ... Fine with me !!!

For materials , I have to include the time and gas (or shipping costs) to go pick them up ...all part of the cost ...
Bottom line : Charge what
you think you’re time is worth ...

Time and materials ...
Note: Once you build a Foamie' , the next one goes
Much quicker , so can be produced more efficiently, with better quality ... good for you , good for the customer ...