Heres another link for you to look at regarding bridgeport or enco
mill conversions. Plans $100, parts around $1500. I built their 4 x 8 router and know nothing about electrical so if I could do it anyone who will follow the plans exactly (no improvements, no changes, no substitutions) you will end up with a nice conversion.
This is only a suggestion. You will decide what is right for you.
http://www.machinetoolcamp.com/knee_mill_cnc.htm
Regards, Dave