Your cheapest route is to find an antique carom table 300-1200$ range, Denver Craigslist had a Schmidt (possibly a different brand) either already converted to pocket billiards or in need of conversion. The conversion will run you $1800-$3000 for pockets, pocket cuts, rail cuts, new cushions installed to correct height for pool, cloth and install. You still have to address any cosmetic issues and upon completion your 5x10 table will have a resale value of about $1000.00 tops...
God forbid you try to covert a modern style table such as a 5x10 GC 1 carom table. Everything Glen mentioned above and then some!!! I know someone who tried.
You can also call companies like Peter Vitalie or Olhousen or any of the custom builders and for the right money they will build one for you. You'll probably be lucky to spend less than $8000.00 installed and will still have a table worth $1000.00...Maybe.
I've seen a number of 5x10 pool tables come up for sale on E-Bay and other sites. If you have to have one, keep your eyes out for them you'll spend $800-$1500 plus delivery and installation and minimize your exposure...:wink:
Just a suggestion, hope this helps
Jay