You bet I do...
But it cost $500, and I think I overpayed a little (I got extras with it though.) Mine is mixed parts on a redesigned American receiver that incorporates a scope rail and prevents use of the retractable stock (which would presently be illegal to install anyway).
Yours is a pretty special and unique piece. HK never made .45 ACP MP5s, only 9mm, 10mm, and 40S&W ones. I myself prefer 45, as do many Americans, so Special Weapons stepped up and did what H&K didn't. H&K finally clued in with the UMP and US civilian USC, but that's a whole different machine.
Personally, I prefer the full size HK rifles and other designs for pistol calibers. So I guess we can both be happy.
If they don't make what you want, the tool companies can have my business...