One of my NPC's droids, has been modified to be allow him to use it as a vehicle. Drall inside an astromech. We're nearing the end of this "movie" and I've had a lot of fun ideas for this character. What it comes down to is I want this modified astromech droid to become Crawl the Drall's Battlemech.
Is it acceptable to fudge the rules if it makes for a great moment or more during the climatic finale of a campaign?