I would certainly adapt the chapters from the manga but possibly with some inovation here and there. Beef up the fight scenes similar to the fight with the cat daimon in the third season. I would also work in all of the side stories right in the seasons themselves. Most of them could fit in cannon with only a little tweaking. I think I would also try to flesh out the SenshiXShitenneou paring and really explore it. I hated the way Crystal killed the Generals off and then the girls got over with just a cry. Actually maybe they wouldn't all be in love with each other but they would be friends. Possibly they bonded and formed close relationships with each other in the past while trying to watch over the Prince and Princess. Either way, I would explore the tragedy of the Shitenneou dying and the friendship/relationship being lost again.
I would try my best to explore the pasts of the Senshi as well, especially the Outers. Maybe a filler episode around Uranus and Neptune awakening. I also like the idea of keeping the side characters alive even if they have only short scenes here and there.
So in a nutshell, keep the show faithful to the manga but not woodenly so. Look for places to faithfully expand and enjoy the story
I would try my best to explore the pasts of the Senshi as well, especially the Outers. Maybe a filler episode around Uranus and Neptune awakening. I also like the idea of keeping the side characters alive even if they have only short scenes here and there.
So in a nutshell, keep the show faithful to the manga but not woodenly so. Look for places to faithfully expand and enjoy the story