I got curious and looked at some previous DMS-1 builds to see the difference between that and a Mustang. Curious what you'll be changing? Are you adding the metal tone plate? And curious if you have found the switches you wanted...as well as where they'll go.
Are you sticking with the stock pickups? Or are you going full Cobain on it? My daughter and I built a "Jag-ish" guitar because she liked Nirvana... But the trem and pups are all Strat (albeit with a hot SC bridge pickup). Cobain, I think actually had the Mustang trem, with a SC Neck and hot HB in the bridge.