Even in the nano reefing community tanks like these are modded to a fair degree. I've seen some clever ways to block off overflow areas. The one thing I will say for the built in overflow area is that it can provide a place for all your gear. No visible filter pipes, heater, diffuser etc. So on the one had the cost might be high upfront but it can keep your tank free of clutter. I would be very suspect on the light too, 14k is pretty blue.