first of all, deathrattle rogue is just a weaker version of mech rogue ; but i know you just want to play this for fun so i'll try to help ^^
not sure if finnley is good since rogue has one of the best, if not the best, tempo hero power
you need 1 drops since you aim for early board control with such a deck and they help with combos (no poisons, no preps)
probably 2 chows 2 abusive or 2 lepers 2 abusives
you should also consider 2x si 7
loot hoarders are a must, or you'll run out of steam too quick
healbot is useless, you want to end the game quickly since you dont have (good) come back mechanics
here is what i would run, just did it so it might be missing some important tools
