Huh, I was under the assumption that Jaeger and Inf companies have two independent AT Patrols at company level. You're never too old to learn something new
The Musti crew question shouldn't be an issue. The crew of the weapon (with the 3 man AT Patrol detached) is actually four men and pretty much always a driver also joins the crew as an ammo bearer, giving it a crew of five. That should give it enough combat survivability. The standard crew of 6 the Musti's had in the original OOB seemed to detach the AT Patrols and then add all the extra men in the platoon (drivers, platoon leader, medics etc.) to the crews.
Also the Leopard 2R looks pretty awesome. Nice work!