First project - coffee table - got some questions!

Hi guys, I’ve got a few questions regarding my first go at doing a coffee table.

• I was going to use biscuits to join the planks for the table top together, is this OK?
• I wanted to make it using Jarrah, but I want the table top to be double the thickness of the Jarrah planks I’ve got. Is it acceptable to glue the planks together to make a double thickness top? Or would this look funny?
• Similarly with the legs? Should I just glue legs together?
• Attaching legs to the top, can I use dowels?

Cheers!