While the "technology" applied to a properly installed lightning protection system may seem within your grasp, you should know that there are UL "listed" or otherwise certified lightning protection installing firms. Would that requirement be part of the bid? Will the installation require a UL certification? Things, with respect to work, may suggest you expand your firm wants to do, but sometimes it's easier to just do what you do best, and leave "specialties" to those subs that wish to specialize in them. I would even say this if work was bad in your area, as you might be able to make as much by sub-contracting this work to a "listed" installer and just pocketing the mark-up