I think if you take a couple appropriately sized blast effects, you can put them in Jaruga's hands, and have an instant jetpack. Problem solved.
Then take them out after you get the picture you want so they don't melt the hands.
I do wonder if there will be anything detail-wise in the final products since they don't seem to have Deathsaurus's chest-panel filler (not surprising considering their size) but we'll see. Everyone seems to want to treat this as though it's the absolute final, when they've clearly stated that while it's the solid concept, there are still things being worked on.