They’re not quite sure yet if this is an insanity case.

The lawyer for handsome young Portuguese underwear model Renato Seabra — accused of strangling, bludgeoning and castrating his fashion-writer sugar daddy in a Times Square hotel — says he is still weighing whether to pursue a psychiatric defense in the gruesome murder.

Seabra gets until April 8 to make up his potentially clinically addled mind.

Defense lawyer David Touger blamed the delay on the current unavailability of medical records from St. Vincent’s Hospital, where Seabra allegedly went after murdering Portuguese writer Carlos Castro, 65, in their room at the InterContinental in January.

Seabra was treated there for slitting his own wrists — allegedly after committing the gruesome slaying.

“We’re still deciding whether we are going to make a psychiatric defense or not,” the lawyer told Manhattan Supreme Court Justice Charles Solomon, as Seabra, 21, sat at the defense table wearing an orange jail-issue jacket and showing no emotion.

“Until we get those [St. Vincent’s] records, we’re not going to make a decision,” the lawyer said after court. “They’re the first people who saw him.”

Also at the proceeding, Manhattan Assistant District Attorney Maxine Rosenthal turned over to the defense 122 pages of crime-scene details, documents not yet public.

In defense papers filed yesterday, Seabra also seeks to have his confession tossed on the shaky ground that since nobody witnessed the murder, Seabra should never have been arrested.

“There were no eyewitnesses to the crime nor any statements or witnesses accusing the defendant of the crime at the time he was taken into custody and questioned,” Touger claimed in papers.

But Seabra had been the only one with Castro in the 34th- floor hotel room, and once cops caught up with him, he admitted — in horrific detail — to the deadly violence, according to police statements released last month.

Seabra faces up to 25 years to life for the murder and is being held without bail.

He admits sparking the deadly Jan. 7 argument by telling Castro, with whom he’d been vacationing here, that he was only in the May-December relationship for the older man’s money, sources have told The Post.

“I’m not gay anymore!” Seabra allegedly told investigators he screamed at the popular fashion writer.

He then grabbed Castro around the neck from behind, dragging the older man to the ground while choking him.

Seabra also admitted stabbing Castro in the groin with a corkscrew, bludgeoning him with a computer monitor, stomping his head hard enough to leave a footprint and at some point castrating the likely unconscious man with the same corkscrew, according to the confession.

laura.italiano@nypost.com

