The May 1986 issue of Model Avaiation had an 11 page build article on that kit. You can see it on the AMA website, members only, archives. Search for that issue and the seaarch words Extra 230.

If you can't get it there, I have a copy I scanned a few years back that I could send you. It is a huge Doc file, some 18M + PMme if you need my copy and provide an email address to send it to.

Don