I’ve always felt that the RX-93 would be a good kit to do a Titans colour scheme on. Its stock colours are already quite different from the prototypical red-blue-yellow of a gundam protagonist, and are not too dissimilar to what’s seen on the Mk-II. For me, it was interesting imagining how things would’ve gone down had Amuro been converted to the Titan cause (as unlikely as that would have been).
Compared to the MG Ver ka, the funnels are susbtantially better. However, with the addition of paint, it falls into the same issues of its internal framework/connectors not being up to the task of supporting such a heavy weight. Bandai really has their work cut out for them should they ever choose to make a PG.