Welcome Matt! IMO, sight glasses are kinda worthless and just another thing to clean. Thermometers are ok, but I end up using a hand held most of the time anyways. I didn't see the kettle, but I would def. have a ball valve installed if there isn't one.
As far as your 10 gallon mash tun...that may not be big enough to brew 10 gallon batches with (same with your kettle).
You're idea of splitting the batches though makes sense, easy to do.