Dare I even mention the Forge World Space Marine primarchs and their double bases now?
Do you use the Horus model on his 40mm base, or on the entire staircase he stands upon? Both are supplied, and both are 'his base'. In that same vein I chose to start the discussion about heavy weapons teams from a custom source (or in my case multiple custom sources) where no bases were supplied, and
GW never gave a clear and consistent rule. Just an assumption, and then a reference to type of model, as opposed to identical sorts of models and current model kits. I know, like probably most people here, that the difference between two guardsmen on individual 25mm bases, or both on a single 60mm base, is huge. The 60mm pie plate is way easier to clip with a blast marker or template attack, and cause the heavy weapons team some damage. The same with Horus on his staircase. Conrad Curze and his archway of balance?
However, when in the spirit of the rules I mention putting custom guardsmen on 25mm bases, and making a scenic 60mm plate to put the heavy weapons team on, and people on other fora still calling me a dirty cheat, an advantage-modeling-bastard, and way more unfriendly things, where is their
RAW then? They never did mention anything to oppose my arguements about that little Rulebook Page 9 entry, about models and base sizes. A list like I made a very small example of, that would be huge. That would be
RAW. Spirit of the rules? I gosh-darnedly put my models on my choice of bases, which I can use in any game with people who do the same. And I haven't found a single player yet who bases his gretchin mob of 20 each on their own 60mm base. To me, it seems, a lot of people still have a bit of common sense.
The mentioning of "Sometimes, players may have models on unusual bases." makes a big difference for mee, too. It implies choice. If I want my regular power armoured Space Marine Captain on a nice, scenic 40mm base, I should be able to, and this part of the rule provides me with just that permission. "May have" grants permission, as opposed to "might have", which states there is possibility even if prohibition could be found somewhere else.
The single most important part of the model basing rule is the rule of thumb at the end about using models of a similar type as guidance.
This, however, might be problematic. Heavy Weapons Teams are of the type "Infantry". So are Chaos Space Marines Terminators. So with this rule of thumb, I base my heavy weapons teams on 40mm bases? Or on 32mm bases, as Blood Angels Space Marines are of the "Infantry" type as well and their current box set provides 32mm bases?
In my opinion, this rule of thumb is shaky, as it allows me to have Horus (Infantry) on a 25mm base (which is unusual for him even though I may have him on an unusual base as per the
RAW) even despite the box coming with not one but two bases for him.