Hi rbrt, not too sure about the spotlights, the visor is made out of heavy duty fiberglass so might be ok to hold them but just wondering would the aerodynamics be effected by them. If you want I could get some pics of my visor up close and email them to you and you could have a think about it. Maybe instead of the marker lights you could replace them with the smaller spotlights as they have holes already drilled. I did not need to modify it any way as it bolted straight on with no problems, but do make sure you get an extra pair of hands to help, as I really struggled on my own holding the visor and drill at the same time. The visor also comes with full fitting instructions which are easy to follow and then you can color match to your truck, I just painted mine matt black which looks good with the amber lights at night.
I have forgotten what multi storey car parks are lol my T2 is just a little to tall for them now. :lol: Hope that helps a little