Reconditioning or New Engine Turbo and Injectors Help Needed

[mk7transit2.4rwd]

Hello I have a mk7 2007 2.4 RWD LWB Transit I brought this to get repaired, was hoping it would be a quick fix but according to the mechanic the pistons, cat, turbo and exhaust are full off oil so will need a new engine and very possibly turbo and injectors as well.
I have been looking around for prices on the work and wanted to see if anyone would be able to give me a better quote on the work.
Please let me know if you can help.