Okay, I've just realized there's a few wee issues with the template.
Firstly, the only official D&D stats for a Decaton are from the old
Wizards of the Coast website and those are only 3.0.
There are D&D 3.5 from Planewalker.com, but those aren't official.
Secondly, there was a major switch between the 3.0 versions of the Base Modrons from the WotC site and the 3.5 versions in
Dragon Magazine #354 (“Return of the Modrons” by Ken Marable, April 2007).
The 3.0 Modrons are all Outsiders while the 3.5 Modrons are Constructs with the living construct subtype.
The
3.5 Dragon 354 Modrons also have the traits
Coordinated Ally and
Fixed Initiative, neither of which seem appropriate for a barmy Brainswapped Modronoid:
—Coordinated Ally (Ex) Modrons work exceptionally well with other lawful allies. When successfully aided on a skill check or attack roll by a lawful-aligned ally, or when aiding another awfully aligned creature, they apply or gain a +3 bonus on their checks or attack rolls (instead of the normal +2 bonus). Furthermore, modrons gain a +4 bonus on attack rolls against an opponent flanked by a lawful-aligned ally (instead of the normal +2 bonus).
—Fixed Initiative (Ex) Modrons are rigid in their actions, even in the most chaotic situations. As a result, a modron's initiative is always equal to half its Hit Dice plus its Dexterity modifier or other modifiers (like Improved Initiative). When combat begins, a modron uses this number as its initiative—it never rolls an initiative check.
Come to think of it, a Brainswapped Modronoid should probably also lose the 3.5 Modron's Lawful subtype as well.
Hmm… I might have to tweak the first draft a bit.
So will we be attempting to update the 3.0 Decaton to 3.5 based on Return of the Modrons? We made the base Modronoid a living construct so presumably the Brainswapped version is going to be as well.