Would really love to see some pics of your scratch-built plane!!! I'll try my best here to instruct - - -
To post a pic click on the 'post reply' box directly underneath the page # line instead of the 'fast reply' at the bottom of this page. At the bottom of the message box click on where it says 'click here to upload'. Click the browse button to find the file you want to upload, then click 'OK' when you are done and wait for the confirmation. Then click 'OK' next to 'preview' below the message window to send the message.

Hope that helps and hope to see some pics.