I's say that 2" is a minimum measurment on extra room. I guess it depends some on the material you are planning to cut. If it's all thinner material like gauge thickness materials less toom is needed because the material is easy to handle. Once you get into thicker material & have to use an overhead hoist or fork lift to handle material. Parts of your machine become much more vulnerable to being hit by swinging sheet metal.
The direction you gantry traveles along 2 of your table frame rails needs to be long enough to park your gantry completely clear of your cutting surface. I would expect to obtain a cutting surface of 4' X 4'. Your frame size will approach 5' X 6' outside dimentions. My 5' X 10' cutting surface is actually 6' 4" X 12' 4" outside dimentions.
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