You folks are all still missing the point that the local building department will be the "cop" on this. They simply will not accept McMansion's plan if McMansion's name is not on the permit. You could probably FORGE someone else's engineering stamps on the plan but that IS a crime. There is nothing to keep you from redrawing the plan by hand and submitting it. You will probably pay more for plan review and they might just reject it without an engineering stamp. YMMV with that. If you are in a place with special concerns like wind codes (east coast) or earthquake (west coast) codes you can count on them wanting engineering but in much of flyover country, writing "standard practice" on the details may work for you.
If you don't need to submit a plan for a permit and you are only giving them to your sub-contractor, nobody will ever catch you. Just cut off the McMansion logo and engineering stamps.