Ok, progress has been made, 5 Pirates are painted up and the grav tanks are taking shape. Prep on the other Pirates is nearly done and 3 more are sat on my desk and undercoated.
Grav tank 1
Grav tank 2
I have 2 Warp Spiders which I've arranged in a trade, they'll be my first Aspect Warriors in the army. Fluff-wise I think I'll have to count their weapons as web guns or a means of delivering a paralysing toxin allowing the Pirates to take slaves during raids. The only other Aspect I could see fitting is Swooping Hawks, the fast attack style seems to work with Eldar pirates though I'd have to swap out the wings for some sort of jetpack.
Progress might be slowed this week due to Chico's Chaos Challenge, depends on whether I can get any of my Chaos Space Marines finished enough to paint.