Random question and it’s probably posted in the wrong place…

Can you fit a 1200x2400 sheet in the back of the l322 even if it touches the headlining - I’m getting some celotex but don’t want to drive all the way for a let down 😂 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF

IIRC the answer is no from when I was renovating my house.

However, with celotex isn't the simplest solution to cut it down to a size that will fit and then tape it back together when you install it in the house? Bish.

2005 110 TD5 CSW
2011 TDV8 Vogue SE (gone)