This is expensive (up tp $200) but easily something you can hand down to your kids. Kramer Handgun leather has horsehide and will do some custom work I have IWB3 and recommend
Contact them. My PPQ and 1911 and any other handgun I want "in my coffin when i die" will be cradled in Kramer!
PS I don't work for them, just been thru $400 worth of holsters so I consider just buying a kramer the economical choice, since I don't have to keep buying holsters.
The Q45 is my EDC. I wear it from the time I get up until I go to bed unless I'm underwater.
I have been carrying Qs since 2011 and a Q45 for the last 3 years. If you want a fine leather holster that will stand up to the rigors of daily use and afford you a safe, secure carry with a repeatable drawstroke I would suggest you look at Wright Leather Works https://www.wrightleatherworks.com/
They make quality holsters. You will have to wait and they aren't cheap but the are worth it. I usually carry my Q45 in a Wright Regulator cross draw (great for a lefty who drives a lot) or the Cobra. I also have Regulators for my P99c and PPK.
Brandon at Wright is great to work with and will answer any questions if you have them.