The idea of having a Fine mecha was mostly intended for smaller creatures. Since a mecha cannot be smaller than his pilot to begin with. Nanoarmor have different rules since they work as armors while a mecha is more of an armed vehicle.
I don't mind your decision. It was mere curiosity.
Multiplications in D&D only add unless noted otherwise.
Yes, but in your homebrew you previously told me the contrary; multipliers stack unless you say otherwise.
If you're using it now, thought, then great!
In this case, however, it isn't a situation of multiplicative addition as ruled in D&D (that being the use of the sum of the involved multipliers instead of multiplying them together). Since there is only one multiplier, it has no other multiplier to add itself to (such as two doubles becoming a triple instead of a quadruple). You're adding a value to a stat, that value being the stat multiplied.
This situation is the question of whether the multiplied value is added to the result or if it multiplies the result.
If it is only meant to multiply the value, without any addition whatsoever, it should just multiply it instead of adding something to it.
But on normal scale? :O
Technically nothing special should happen on normal scale.
You'd have a combat map for those in normal scale and one for the mechas on mecha scale.
The diminutive mecha would share its space with the non-mechas on mecha scale to attack them.
The only problem with that is determining where the mecha is supposed to be located on normal scale, where precision actually matters to the non-mechas. Which makes Osle's ruling of giving them normal scale reach an ideal solution.
... also, are we assuming the guy in question has Spring Attack and/or Shot on the Run, here?
Nah, it is all about the fact that their movement and attack range is in MU scale. You can kite them easily when your 5ft step sends you 30ft away.
