Here's shuttle 8019 now with a real fin instead of the missile launcher as suggested by u/Lordbricktrick and u/mcbaine37. I removed the launcher pieces and pinned the fin in between the technic
LEGO MOC Nu-class Attack Shuttle by LeslieLee | Rebrickable - Build with LEGO
LEGO Star Wars: Republic Attack Shuttle (8019) for sale online | eBay