I recently completed a LEGO MOC (My Own Creation, an unofficial model created by independent designers) of the French high-speed train TGV Duplex. While I’m a fan of all things train, the TGV will always have a special place in my heart for personal and familial reasons.
LEGO Ideas is a program enabling amateur designer to have their work become an official LEGO set. However this makes submitted designs unavailable for everyone else to build whether they are selected or not.
I bought the LEGO Technic 42098 Car Transporter set to build a custom design, and my decision to still build the official model was a mistake.