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1) service supply--overhead drop or service lateral?
really up to the customer, asthetics vs. $$$$ are key
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2) For an overhead, is SE cable used for the service entrance conductors (SECs)? If you have a choice of cable (SER?) or heavywall, does lower cost dictate use of cable?
#2 SEU =100A 4/0 SEU=200A, and yes it lowers costs.
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3) For SECs run in pipe, is aluminum or copper used?
condutor/pipe sizing may dictate CU
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5) Do you install a meter/main combo, or a meter pan and separate cutoff?
meter/main is easier, looks better too.
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6) With a meter/main, do you bond the neutral and the grounding electrode conductor on the main breaker side? If so, do you run 4 conductors to the house panel (with floating neutral bar), or 3 (with neutral bar bonded to ground)?
The MBJ would be in the meter/main, a 4-conductor SER 'main feeder' would then be the norm.
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7) With a meter/main, do you usually use an MLO house panel?
normally, yes.
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8) To go from meter pan to cutoff (or meter/main) to panel, do you use Sched 80 or cable (SE)?
cable is cost effective
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9) Grounding electrode--for new construction, is the Ufer made of rebar, or #4 copper (or something else)?
Look here
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10) GFI breakers are rarely used with all-in-ones; after all, who wants to go outside in a bathrobe to reset a tripped bathroom circuit? Is it typical to use GFI breakers with an exterior meter and interior (basement) panel?
situational, i find that external GFI's crap out fast in New England, and a breaker can do quite a few receptacles....
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11) Do you use a backer board or one-by lumber standoffs when mounting the panel on a block wall? Or is the panel fastened directly to the wall?
depends on if it's a dry or damp [dirt floor, etc] basement...

may the poll continue Cliff.... [Linked Image]