Ok so I know that most conflict is done through small scale combat. But even so, we know that the nations still maintains for conventional military (i.e., space navy etc.). We also know from the RPG that they have space fighter craft. So would it be safe to assume that they would have transforming fighter mecha? I mean what more manga than transforming fighting mecha?
If any of them do it would be experimental or too expensive to mass produce for an army. If they did exist then those models would be few. Does your campaign henge on transforming mecha or would piloting normal customized T.A.G.s be able to fit into your idea?
mechas are they are usually set up much furder in the future or have an alien origin, the technology in infinity is simply not that advanced. If you want to add mechas jets tanks or whatever you can do it, rule of cool>base settings