When you said 'original designs'*coughripoffcough* did you mean 'Wings Of Gibraltar' and 'Firestorm'? Now i wasn't able to read those comics, but base on what i read in the internet, the story was supposedly inspired from Macross Plus.
Now i do believe there's still a possibility to fix Robotech Sentinel, but it's gonna require a massive overhaul.
First, finding a way to put the remaining Macross Saga characters on the back burner and instead focus more on Jack Baker, Karen Penn, Rem and other new characters.
Make the Sentinels less goofy. The concept of some of the Sentinels are good but needs to ditch the 70's campness.
At least make Edwards motivation clear. In the comics his motivation keeps changing from 'I'll get my revenge on the Hunters!' to 'I want to rule the Galaxy' to 'I'll do anything to save humanity, even if it's means allying with the aliens'. I swear, Edwards changes motivation more than Minmei changes boyfriends. Talking about Minmei...
Giving the extra characters some relevance. I mean really, what's Minmei's purpose on the Sentinel other than regretting letting Rick go, and going on a boyfriend binge left and right?[
New Veritech fighters. New Veritech Fighters. New Veritech Fighters.