What is the actual material and thickness of the backboard? I've seen 1/4, 3/16

The glass itself is about 1/4 of an in, and the framing, metal included is about an inch or a little more than an inch thick. Hope this helps you.

How far below ground level should the bottom half of the pole be sunk?

The ground sleeve is 16" in length, 14" of it will be in the concrete. Thus, 14" of the pole.

If I toss the sleeve, given all the concerns it may cause, how deep does pole go in concrete?

I would go just a couple of inches deeper than the sleeve is long. Any deeper and you run the risk of not having the rim go all the way to 10 feet high. Putting it in the sleeve gives the whole thing more play when you're shooting which is not a good thing. They really should make the bottom post longer so you can sink it deeper for better stability. Good luck.

Brand	Spalding
Material	Glass
Color	AC4504
Item Weight	145 Pounds
Indoor/Outdoor Usage	Outdoor
Special Feature	adjustable
Mounting Type	In-Ground
Target Audience	Unisex Kid
Model Name	U-Turn
League	NBA
Included Components	Detachable handle
Frame Material	Aluminum
Minimum Height	7.5 Feet
Style	2021 Version
Assembly Required	Yes
Maximum Height Recommendation	54 Inches
Global Trade Identification Number	00689344334820
UPC	689344334820 714547183552
Rim Size	18 Inches
Manufacturer	Spalding
Overhang Distance	2 Feet
Item Package Dimensions L x W x H	66.5 x 36.5 x 11 inches
Package Weight	71.67 Kilograms
Item Dimensions LxWxH	11 x 54 x 11 inches
Brand Name	Spalding
Number of Items	1
Part Number	88454G
Size	54"
Sport Type	Basketball

Spalding U-Turn In-Ground Basketball Hoop

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