Reply To: 10mm, Historical and Fantasy Questions.

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There is a whole bit about frontages with other sized bases in Appendix 2 of the Warmaster Ancients rulebook.

Using a Common Frontage
Stands that normally face the 20mm frontage in
Warmaster Ancients pose the most problems for existing
armies that have been based for other game systems
namely units of phalanx, chariots, elephants, and shock
cavalry. Some players will doubtless have 5mm or 10mm
armies that are incompatible with the narrow basing and
we recognise that re-basing may not be practical or
desirable.
Rebasing will definitely pose a problem for players using
15mm models, many of which are simply too large to fit
onto the narrow edge in any case.
To accommodate players who do not wish to use the
narrow frontage, all ‘short’ 20mm frontages can be
optionally mounted onto ‘long’ 40mm frontages as per
standard infantry and cavalry.
Stands switched from the 20mm to the 40mm front edge
add +1 Attack modifier when charging and pursuing
Note that this is the same as the standard rule for Shock
cavalry mounted to the long edge (see Shock p127). Use
whatever depth is required to fit the models. The tw«
frontage types are not exactly equivalent but the effect is
comparable.
In some situations, the wider frontage and bonus confers
an advantage compared to the narrow base, in other
situation it is less effective, but overall it is an acceptable
compromise that allows the two basing standards to be
used on the same battlefield. You may find that in some
instances, such as chariots, the wider base can
accommodate two models slightly staggered. In other
cases, such as Elephants, it may be desirable to fill out the
base a little with supporting infantry or scenery. It is a
good idea to deepen the base of the phalanx so that it
looks more like a block of troops (eg, 40mmx40mm), This
is simply a matter of taste — the number and arrangement
of models makes no difference to the game itself.
Note that it is perfectly acceptable to mix 40mm and
20mm frontages together either in the same or opposing
armies so long as the ‘shock’ bonus is applied to units on
the broader frontage as described above.

But why go through that hassle if you can avoid it in the first place?