Well I could not find a direct tutorial for the 1pc so I just got stuck in.
I took of the rf and cap and cut out the visor with a craft knife (Warning: be very careful when doing this as the helmet plastic is rubbery and one slip with the knife could be costly)
I then sanded of the trademark writing etc from the back and gave the helmet a good sanding down all over.
Primered it all with one coat of paint and once dry I have given it a coat of metalic.
Next job is a clear coat and another metalic coat, then onto the weathering and top coats.
I'll post up my progress and maybe some pics. Be patient with me tho as I have never made or painted anything in my life, not sure my DIY skills are all that good.
Thanks.