Yeah, I def. also hear it on Pet Sounds. Definitely the percussion as well. Let's Go Away For A While is a good example of the marimba/xylophone stylings.
Definitely.
If Brian did get any influence from Lyman, it definitely showed up in Smile (Love To Say Dada, Holidays especially*).
*very loose influence, but Brian sure did seem to love that marimba/xylophone-esque sound