Mr G - Apologies if you’ve seen these already, but there is a basic MX250 build manual here:
http://www.madabout-kitcars.com/foru...ead.php?t=3943
You will also find links to various MX250 builds in this thread (keep paging down).
http://www.madabout-kitcars.com/foru...ead.php?t=4623
Note: Unfortunately, there have been technical problems with some photo links on old threads.
Hope that helps, good luck, Paul.