Any sizing mistakes or anything?

PokerStars, $3.92 + $0.48 - Badugi Pot Limit - 800/1,600 - 5 players
Replay this hand on Pokeit

UTG: 6,800 (4 bb)
CO: 17,745 (11 bb)
BU (Hero): 59,437 (37 bb)
SB: 51,735 (32 bb)
BB: 36,174 (23 bb)

Deal: (2,400) Hero is BTN with 6 A 5 6
2 players fold, Hero raises to 3,200, SB calls 2,400, 1 fold

Draw One: (8,000) A 5 6 5 (2 players)
SB draws 1, BU (Hero) draws 6c
SB checks, Hero checks

Draw Two: (8,000) A 5 6 3 (2 players)
SB draws 1, BU (Hero) draws 5h
SB checks, Hero checks

Draw Three: (8,000) A 5 3 2 (2 players)
SB stands pat, BU (Hero) draws 6h
SB bets 2,400, Hero raises to 15,200, SB folds

I'd bet flop or turn. Turn for sure since I don't see him checking if pat after it goes x/x on flop. Yes we could be behind a better 3 card but he didn't 3b pre so unlikely to have the best 3 cards, really we just have to worry about a 5-lo 3 card which maybe will fold to a double barrel. The argument for betting flop and turn is not only to bluff off a slightly better hand but to get value and protection from a worse 1 card draw. Honestly Villain's line doesn't make sense as he does indeed pat river, contradicting my above analysis. I wonder if it's a snow? Or just a bad badugi? Or else a really good one? I guess the big river raise makes sense as Villain to me seems polarized to really good or bad hands. I'd be curious to hear what others think on all streets.

thank you.

Yeah, i never know what to do with a 6-lo tri or a bad 5-lo tri in a lets say 3way pot...
I'm betting 7-lo and 8-lo tris for bluff and 3-lo and 4-lo tris for value, but with a 6-lo tri im usually in a check/calling bluffcatching mode

in regards of villain's range and logic - no freaking idea