Charm for 6 system landscape

Hello experts,

Would you help with some tips on the 6 system landscape for charm solman 7.1

I have a landscape as follows

Dev-->Quality1-->Integration-->Maintenance-->Quality 2-->Prod

Two tracks one Project track and one maintenance track ( Maintenance--> Quality 2--> Prod) .

Retrofit from Maintenance box  to Dev box

One of my query is as i have 2 quality system in the Project track... is there any complication?

thanks in advance

Regrads,

Rony