well some of the requirements
Waterfall Quest for example
give strength experience.
to complete dt, you'll get strength and attack exp one way or another.
The lowest stats would be:
32 Attack
30 Str
1 Def
40 Range
11 Prayer
50 Mage
And 10HP technically. Although, i think it would be extremely hard to do DT with 11 prayer, 1 def and 10HP.