EVM in the state machine?

[zach-is-my-name]

Wonderful wonderful proof of concept I'm so happy... obviously the WORLD wants rollup to be generalized, and we won't be doing bespoke things forever

I'm really hoping to get an understanding of the challenges / modifications necessary to run an EVM for aggregaters and validaters before I attempt to contribute

Some things I'm thinking about

• Can gas and rollup co-exist?
  On the user and implementation side it could be an annoyance or distraction.
  But on the aggregator side it could be a way to benchmark fees (or not)
• Could it be this easy?
  This gives you a state root: psm.getStateRoot()ethereumjs-vm/example

applyTransaction() in rollup-state-machine.ts
similarly calculates a state root...

There just seems to be a lot of overlap but I know there's a few gotchas I'm overlooking...