If you're going to go deep, keep in mind that Meikon's pistol grip is rated only to 20 meters. Pistol grips are generally a feature of surf housings rather than scuba diving ones, as underwater we frequently want to bring the camera down to the bottom and a pistol grip would get in the way there. You also can't mount it simultaneously with a tray, which limits your light attachment points to just the cold shoe. Also, 10-18mm won't work with a 4" dome; that dome is tiny - here's a picture of the housing with macro port, flat port, 4", 6" and 8" domes:
Likewise, 16mm+VCL-ECF won't work in the 6" dome, as that dome's barrel is too long, and the tiny lens won't clear it. Tokina 10-17mm should work in the 6" dome, but you'll have to DIY a gear and there are reports that it doesn't AF very well in poor light. Note that this test was done with an A6300, which has much better AF capabilities with adapted lenses than A6000 and the reviewer still wasn't impressed. Other reviewers have posted different opinions though, so your mileage may vary.
Sony isn't the only game in town when it comes to mirrorless - there's Fujifilm, and more recently Nikon Z6/Z7, Canon EOS R/RP, Panasonic S1/S1R, not to mention the extensive micro four-thirds lineup from Olympus and Panasonic. Not all mirrorless cameras are small either; bodies like Olympus E-M1 and Panasonic GH5 are pretty much DSLR-sized.
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