Drain pipe holes?

[legepe]

Hi all

Ive got a Nissan Navara NP300 with a Roll & Lock Style Tonneau Cover fitted

Does anyone know where and how the drain off pips need to be fitted

I have drilled through the bulk head on one side but there is a gap of around 40mm between the bed liner and the bulk head and I have no idea how to get the rubber tube through

I guess I may have regretably done something wrong, and would really appreciate any advice!

See pics

Thanks

legepe