E-Revo Build Questions

I am looking at building a E-Revo from scrathc. What chassis would be better to start with? The E-revo plastic chassis or a 3.3 metal chassis?

With the 3.3 chassis I was planning on putting the 3905 E-maxx transmission on it.

If I went with the E-revo chasis can I adapt the 3905 trans to it also or will I have to get a E-Revo trans?

Which would be better? I will be running a MMM 2200 setup.