Rumble Jungle is not a cheese pick, it's definitely his best position after the changes to Runic Echoes. The primary strengths of it are his clear speeds (faster than Lee Sin and comparable to Diana or Master Yi) and his ult range (standing even with mid lane outer turret means you can ult anything past the range of the other outer turret, beating wards).
18/0/12 masteries with Deathfire Touch. Attack speed marks, flat armor seals, flat CDR glyphs, one flat CDR quint and two flat AP quints. Q, W, E, max Q, max E, max W. Always start at krugs with
because the AoE in your kit means you get more sustain from talisman.
potentially swapping your last two items for any of
It may take a bit of practice to manage your heat. You want to overheat every other camp during your first clear, and about once a camp every clear after that. With the 10% CDR in your runes, you can overheat with 5 casts of your Q if you spam it off cooldown.