This + value the time of your employees. I've burnt countless unbillable or discounted hours doing favors, 'demos', clean-ups, etc for employer's friends, favored clients and contractors. Its never worth it.

Builders love to have the new or prospective low-voltage guy come fix up their house or show-home, and its always a wreckage of spare parts and knotted wiring.

Over-promising and under-billing in this situation is going to set the wrong precedent for any future business.