i try to get everything in 1.5" squares,but smaller will work.i won't buy smaller than 1.38" in case i had a forearm in mind,nut wanted to switch it to a handle instead.
the lenght of the cue pieces should b around 18" so you can get the forearm and butt off the samw piece to match each other.
the handles i get are 12+" or longer.i usually core the handles and all i need is a small 12" or longer piece of wood since my handles are 11.75".if you wnated to use a solid handle you will need 18" or longer so you can use the bottom of the handle piece for a butt sleeve dowell and you will need 1-2" for a tenon on the front.