Here's something really useful when a string sound is to be sought, even if you have only one guitar! Play E6th on a classical guitar and you'll hear a cello timbre. We hold the Bow frog using either western or chinese style; this last one as shown in the picture.
A little trick: turn down your guitar, lay it on the ground, sit cross-legged and play the E6th string… With a little practice you will become Yogi Master !