Dude... that is... an awesome conversion! Love to see it painted. Just needs like bits of metal or something on it and a Snotling (like the one on the Shokk Attack Gun suction hose) hanging for dear life!
Scratchbuilding Orks gives you a pretty wide margin of error cause they are meant to look messy. Deffo recommended them when your leaning the basics. Like learning the basics of sculpting greenstuff by making nurgle deamons.