I'm glad it worked out so well for you, crcindy!
I've been thinking...
When I bought my set up, they charged individually for each of the frame parts...I had to choose how long of a table I wanted, wheels or not, how many bars, lights-yes or no, and all the other features I wanted. The rails are standard size, so the carriage (bought as a separate component) had to fit the machine I chose....it's wheels are also standard size with a different size frame on the wheels to fit different machines.