See the custom shop page for a list of custom shop dealers. My understanding is you must use a custom shop dealer for a custom shop order.
http://glguitars.com/customshop/
There is a difference of made to order guitars and custom shop. I have two made to order guitars, but both were purchased before G&L opened their custom shop. Option Order allows you to pick from standard options which include some of the items you are looking at: Flame maple top, your choice of finish (though not nitro), choice of pickguard, binding, body contours, body woods, neck profile and nut width. I'm not sure if roasted maple is an Option Order selection. Gold hardware is not a option order choice. For option order, you can go through any G&L dealer that is will to place the PO. Both of mine were through Music Source, but I don't believe they are a G&L dealer anymore. Not sure how easy it is to get either option order or custom shop in Europe.
http://glguitars.com/made-in-fullerton-guitars/
Hope this helps.