Sounds great.
I'm not sure which island you have in mind, I really haven't found any good ranges on any other island other than the desert, but I'll keep looking.
On real ranges (or tables as the Army calls them) Bradley/Tank crews go though a series of engagements. Usually about 7. Between each engagement there is an aprox 30 second break.
We fire about 3 engagements in the first battle position, then have an offensive engagement where we are moving from battle position (BP) 1 to BP 2, then have the final 3 engagements from there. I don't know how hard that will be to create in the mission editor, but thats the real deal.
Also, Bradley tables involve trucks, infantry, and BMP. No tanks. Infantry engagements are 600-800 meters, truck engagements are about 1000 meters, and BMP engagements are 1200-1400 meters.
There are some engagements are duel engagements with any combination of the above, with stationary and moving targets.
I hope this isn't too much info. I'm just giving you a rough idea.
I'll make a mission as well, as I see it. Mine will mainly be placement of objects to make the mission "feel" like your on a range.
I'm pumped, can't wait for your mission!!