Here's one for about 1/2 that :
https://www.oldmodelkits.com/index.php?detail=61307&searchtext=pontiac%20parisienne&erl=MPC-1-25-1968-Pontiac-Bonneville-Hardtop-968-200
Welcome Aboard !
Can't help you with the app .
If I was going to do something like that I'd use an old school timeclock , ;) . More visceral .
Hope to see some pix of what you're building .