Thanks for the responses.
Matt1, I understand what your saying, however, i'm no expert and we are talking about placing a loaded firearm into this. Safety is priority #1 and I am personally not comfortable with a DIY holster. I paid for the most expensive holster available and expected a perfect fit. Sure, Glock frames may vary slightly so maybe DAA should make more than 1 block for the different Gens.
yigal and frgood, thank you for the reassurance.