Absolutely. The pictures in the manuscripts tell us that certain kinds of decoration were within the conceptual repertoire, and were probably actually done in some cases, so it's better to work within that repertoire than to make something up from whole cloth. But they usually depict the most-important people at the most-important events, so they're not a statistically representative sampling of "typical"; I have no qualms with turning down the knob on the decoration (especially if it means we'll actually get it done in this lifetime).

Will McLean (M. Galeron de Crecy), whose arming pavilion we use at living history shows now, saw his pavilion fully set up and furnished at a show once before he died. A lot of his friends came to that show knowing it was his last, and he spent much of it sitting in his tent, pronouncing it a job well done. There was some roof decoration he hadn't finished yet, but there was enough to make it clearly a 14th-century-decorated roof.