I am dealing with the EXACT issue right now with a local independent. They hired the area low bid hacks to move and repipe the cases in a minor remodel. Went from electric to gas. The piping looks just like the picture you showed. In addition, the liquid line was not up sized for proper draining and the suction was not properly piped and bullheaded for reverse flow. Cases build ice and need thawed ever 2-4 months. Its a giant mess.
Customer doesn't want to spend the money to correct it.
"Don't wish it were easier, wish you were better"