Silkworms and Screamophiles welcome you! Hi, I am Lagvaldemag and you can call me Lag. Welcome to the Wiki. As you're new, here are some helpful links for you:
I'm not sure in which comic it was mentioned. Probably in one of the handbooks. You don't have to read either because it's listed here, on this Wiki. Just look at his page you tagged.
I dont know about 616, but in 1610 in USM #100 at the end mark bagley's character sketches are given and there peter's height is mentioned as 5 feet 7. 616 peter should have around the same height.