I've just put some rockshox on my Drayton c15. Way better than the betors I had on i seem to be able to feel more what the tyres doing. Well impressed. Give Gary fleckney a call nice chap and very helpful
Make a bung out of plastic or rubber and put a tube through I t for a breather. Look on Duncan McDonald s cub site he does one with a breather pipe but not sure if it's a push fit or screw in. Have fun