You will find a lot of folks here that can help you through your restoration and understand your "why are you doing this?" answers!
Unfortunately, I don't think you'll ever find "blueprints"...
for your trailer.
However, you can obtain an Owner's Manual &/or a Service Manual.
You can get photocopies of owners manual (1964+) and service manuals (1972-1986) from:
Helen Davis Secretarial Services
PO Box 484
Sidney, OH 45365
Prices are about $33 and $70 respectively. After 1986 the Owners Manuals included available service information. Or they can sometimes be found on ebay for less.
Good luck in your restoration...