No Way I Would Ignore THIS
For the record, I think any attempt at a SHOGUN WARRIORS movie would be an exercize in intellectual properties Hell. Not only were there instances of "concept rape" in the translation to American (no human characters imported, for a big example) but the mecha designs came from at least three different sources that were, and still are, competitors!
Across town, the would-be creative team behind the proposed ROBOTECH movie are awaiting a greenlight from Warner Brothers. They have the backing of Harmony Gold (no duh) but are basing their story on Macross Saga which means they'll have to somehow placate Big West and Tatsunoko (the Japanese creators and rightsholders for the original content).
PS: The scorecard on the SHOGUNS (cribbed from Wikipedia)...
* Dragun, Poseidon, Raider, the Mazingers, Gaiking and Grandizer were all from the imagination of Go Nagai. And there is a Mazinger TV series that either is currently running or recently finished in Japan.
* Combatra, Voltes V and Daimos were from the (future) creators of Voltron at Toei Studios.
* Danguard Ace came from Leiji Matsumoto, who also brought us Captain Harlock and Star Blazers.
* Raydeen was created by Yoshiyuki Tomino, who went on from that to Mobile Suit Gundam.
* 17 was from a Japanese live-action show, and Leopardon was from the Japanese live-action version of Spider-Man.