The only large scale kits I build are motorcycles. There is just something about big scale cars that I can't get into. Maybe it is just familiarity with 1/24 - 25th scale kits. I used to build a lot of 1/43rd. I have even built 1/87th (HO) kits. I haven't built a 1/16th car since I was 15 years old( Revell Funny cars). I scratch build a lot and I still stick to 1/24-25.
Ultimately it seems like too big a project to build a big scale model to the level of detail that satisfies me.