As stated, Arcane Tricksters are hard stuff to build. My favourite take on it is a melee Arcane Trickster though.
Ninja (scout) + Magus (kensai)
Slower spell casting, however with a whip you can stay at range and deliver full round attacks. Ninja gives you an extra attack as a swift action (colliding with some magus arcanas, but still) and Magus allows you do do SpellCombat, which is yet another attack. Can also turn invisible as a swift action.
Strength and Intelligence, some dex?
Not the most efficient but an interesting character to play with, having to watch out for positioning yet with some strong defensive options (Mirror image/invisibility as swift/decent AC-shield-int-dex-armour) and a mix of everything. Oh and sneak attack cause that's what we're here for.