Unfolding, folding, opening, twisting, turning, exposing areas and revealing hidden parts is basically what mecha transformation is all about. There is no one way to do it, and the sheer amount of examples there exists eclipses the scope I’m willing to work for free. To tackle transformation schemes in general requires part problem solving and part puzzle making in a nice balance, where a irregular shapes can be turned into e.g. a humanoid and vice versa. By first introducing this sort of base idea of categorizing transforming mechas into will give some foresight how I’ll tackle the subject down the line.
Much like Three approaches in mecha design (which will be rewritten at some point this year,) I tend to employ a similar template for transforming mechas specifically. These three are not necessarily connected to the three initial approaches as some sort of rule, but they do work under them if you’d wish to make a transforming mecha. These might help you to lock down your approach better. This post can barely scratch the surface of it all with the given limit I’ve set to myself.
The three approaches in transforming mecha design are Fantastic, Toyetic and Realistic. As with previous, there are overlapping elements with each of the three and can be even split into sub-categories if necessary. Examples of Fantastic transforming robots are all the outright impossible ones in any form outside animation and movies. Getter Robo and Gurren Lagann are probably the best examples, where thing just fall into their place and morph into new shapes. Mass shifting is nothing short of expected and even mandatory.