Sure, with the right tools and experience, it is doable and an option that some folks choose.
Two other thoughts I had about this in regard to the Dyna chassis would be the implementation of the star ground and the new, higher-rated quad cap with the discrete electrolytics stuffed inside.
For anyone wanting a star ground, you still might need to run the wire to the solder lugs adjacent to the quad can. If someone were inclined to make the star out of the twist tabs alone, again, it could be done with the right equipment and experience, but there would have to be enough room at the twist tabs for all the ground wires to connect before soldering to the chassis. I am no expert on star grounding, but I would be tempted to question whether this would be as effective as having grounding lugs concentrated at a single point on the chassis, but I guess it could work well enough.
With regard to the quad cap that has the discrete electrolytics stuffed inside, I can see the soldering temperatures on the can melting the plastic casing on the electrolytics stuffed inside, though I am not sure what, if any, practical consequence this could have. What may be more of a concern is that the discrete electrolytics must make their ground connection inside the can somewhere that must ultimately be connected to the twist tab(s). It would be interesting to see a schematic or a diagram of how the electrolytics are configured inside the can – maybe the connections to the capacitors inside are crimped and not soldered, I don’t know.
But, without knowing for sure, I don't think I'd want to put soldering heat on the twist tabs for fear of melting solder connections inside, or, even if the leads inside are crimped, it’s still a lot of heat conducting along the leads into the individual capacitors, which is generally undesirable. I once contacted some capacitor manufacturers to discuss the effects of duration and temperature in soldering to leads - the less the better, and, after something like a few seconds of soldering heat, the capacitors' performance could possibly begin to be progressively compromised.
Worth considering. Of course, none of this might be terribly significant.