Yes, but you have the problem that the base counts as part of the model - meaning that it can't stretch outside of your deployment zone. Arguably, if you measure shooting from the edge of the base, your enemy can shoot at the edge of the base and hit your model too - meaning your dreadnought at the back of the board could end up lascannoned on the first turn. But true, it does say in the 40k rulebook - you can enlarge a base all you want, but you can't downsize one.
LoC
LoC