Fairlane Sunroof

[CONGO MILLENNIUM]

I have always wanted a car with a sunroof.
Recently I purchased a series 1 AU Fairlane Millennium with the Tickford VCT 6 Congo green with black leather interior, a beautiful car in excellent condition only travelled 140000 klms

Unfortunately there is no sunroof

So being a pretty handy sort of a bloke I am thinking of installing a sunroof myself.

As finances are not great at the moment it will probally be a second hand unit. Quite often there is one or two for sale on ebay and gumtree etc.
I like the spoiler type such as the Hollandia 300 which is electrically operated and slides back over the roof making installation easier not having to take out the headliner.
I've researched the installation online and I feel confident that I can do it.
There's a couple of items I'm not quite sure on, hopefully some one can help

When cutting the hole in the Failanes roof is there any steel stiffening braces or electric cables to be removed or cut through?

When connecting the electrics the switch connects to a posative from the ignition switch? Would connecting to the map reading lighting be ok? Or is there a cable in the loom above the headliner as a sunroof was an option for Fairlane?

If anyone has done a sunroof install any tips or help would be great