Here's warpath as seen in War for Cybertron with a bonus custom character (I didn't realy like greenlight so I decided to make a new Female autobot, this time an aerialbot). I don't think warpath Looks that good, the transformation isnt the most accurate and since I couldnt make a way for the cannon to go inside and still look good, I made it detachable... but that's the best I could do with the pieces I have. Version 2.0 comming soon, hopefully.
These are getting better with every one you build! Making sliding parts is really tricky, I think the solution you found for Warpath is fine. And actually I really like Flareup in both modes; 2 for the price of one! Well done!