If you wanna mod your AC's...best guy to ask will be Larry.He's done tons of mods on various locos.He'll know best.All I can think of is that you'll need extended couplers to make 'short' turns.....hope you get sorted out....keep us up to date
I left the couplers as is..as for the under carriage,all I did was file abit on the hole where the trucks swivel in ( to get a shorter radius ) & I removed the plastic 'couple-things' ( which kinda holds the trucks together )...which tend to bump against the under carriage when it turns sharply & causes the trucks not to turn as short when their in place.....no glue