Hey Pelon505,
Welcome to the forum. :thumbsup: You've come to the right place. There are a lot of very knowledgeable members here whom I'm sure will be able to answer any questions you may have. I'm new to the trike world as well and I got my first trike last year (a 74 Alsport Tri-Sport RTS SL) that I bought from a member here. And I've gotten a lot of help here and made some new friends along the way as a bonus.
Cool three wheeler btw. Like I said, I'm new to the trike scene, but If I'm not mistaking, it may be a BIRD Engineering design judging from the attached pics and comparing them with yours.
Shawn