Customizing is normal in my community (no-wind, 5 months per year) and I am a former kite builder myself. Retail destined products have a material cost/labor point where extra efforts will not increase the purchase price consumers are willing to pay or profit margin for the manufacturer.
For yourself though?,... you'd do anything, buy any supplies or product, use difficult materials, carefully plan your design around powerful graphics. But if you had to make a five dozen of 'em, you'd certainly make compromises, use templates, assembly jigs and repeatable techniques. You'd source only raw materials that fit within a specific price point. Wasting of fabric scraps would not be expected, just as an example.
I have access to several excellent kite builders within my local club and I've been a quad-head for a couple of decades, almost exclusively. I have stolen every idea I ever liked and done a ton of experimenting to determine the proper "feel" on the ends of the lines.
Finally, my wife loves custom jewelry, so I can justify my decadence with the best gal (who also runs the wallet of our household!) This kite was easy to acquire, she showed me some new earrings and I knew she could not refuse her 3rd husband, regardless of the final cost. In fact I should have bought two of them for pairs flying, "HEY you've got 2 ears, it is only fair Sweetie!"