Badging a WW2 RE Jacket

[Shiny]

Hi All,

I'm trying to badge up a battle dress blouse as per a relative's service and am looking for a bit of help.

I know he was in 712 General Construction Company for most of the war and was evacuated from La Panne.

I have got a pair of red cloth Royal Engineer shoulder titles and I know he had 4 years service chevrons. Are the red cloth shoulder titles correct or should I have brass or slip on's?

I'm also at a loss about what div badges to get, can anyone help with that?

Thanks a lot,

Michael