Have no clue where this should go....

OK I am aware of a fairly distinct gap of snake species that are primarily only arboreal....and on the other side primarily terrestrial....are there any species that are a decent mix of both?

I am looking for one that would go well in a large custom built enclosure that has a good bit of branches, trees as well as ground habitat...

Not in a rush for getting whatever it may be but just rather curious and thinking about this for next year....

Carpet pythons are semi arboreal.

....are they noctural or more active during the day?

Some Carpets are known to enjoy both ground and arboreal life, as does My BCL. If they are legal where you are Eastern Fox snakes a found in rafters in garages and hunt camps as often as in woodpiles.

While my 2 adult and 1 juvenile BRB's are all primarily nocturnal, they've all climbed given the opportunity.