Nice for Vitesse to come back to you so promptly Peter.
I was in work today but two virtually back to back tours and a three wheeler test drive gave me no time to ask about the gearbox tunnel or extension. At least the later has been solved....ill ask about the tunnel remove issues tomorrow.
On my 4/4 I did try to remove the cover and gave up as the front was heavily glued to the bulkhead with silicon sealer!