I was able to buy a junkie Titan class Trypticon (thanks to PrimeCron) so finally carried out the plan I have for a long long time --- create a Trypticon that can dwarf Metroplex and still transforms.
Stand straight, Trypticon is much taller than Metroplex.
Even bending the knees he is taller than Metroplex.
more size comparison, with my normal Trypticon.
And with MT Metroplex repaint (metropolitan).