He hadn't known about this room - he'd found Anakin in the Force - but he should have guessed. There were never any parts laying around when he visited the quarters Anakin shared with Padme. He wouldn't not have any. The younger Anakin had bits and pieces strewn all over their rooms.
He stepped inside at Anakin's invitation, glancing around.
"You're busy," he surmised, his eyes glossing over the schematic. "It's not important." He could talk to him another time.