TC has limited details
Transport Canada records show the builder as Brian McMullen, also of Ontario....roughly 2000, sold in 2005 to current owner.
not much help, but perhaps he's still active in the RV world????
C-GFBS Harmon HARMON ROCKET II 161 Certficate of Registration 2005-09-29 McInnis, Leslie 2005-09-29
C-GFBS Harmon HARMON ROCKET II 161 Cancel C of R 2005-09-28 Mc Mullan, Brian 2000-03-02
C-GFBS Harmon HARMON ROCKET II 161 Certficate of Registration 2004-03-10 Mc Mullan, Brian 2000-03-02
C-GFBS Harmon HARMON ROCKET II 161 Certficate of Registration 2000-03-02 Mc Mullan, Brian 2000-03-02