For customising and fit you'll do well to get more useable than a treemotion harness, put what you want where you want, dmm vault and petzl caritools are perfect fits, or just add a biner wherever you want, on waist or leg straps
Also has two sets of D's, a rope bridge with a sliding alloy ring, life support point on the back, more attachment points than can be used and they're everywhere, full adjustment, good padding, secure fit and nice buckle clips.
Doesn't pull down with a big saw hanging off it either