Once more into the breech dear friends, after a few days of doing odd jobs about the house and garden I'm back onto fitting these windows.
After I had marked up and measured the cut outs and measured them again the horrifying business of actually removing great swarths of panel from the van sides has started.
In the first three pictures on the sliding door it shows where I've marked it out on the inside for the cut out size and drilled an 1/8th inch hole through each corner so that from outside I can using a permenat marker draw a line from corner to corner.
I then lay in my case 2.1/2 inch gaffer tape along the outside of the line to stop the jigsaw foot scrapping the paintwork.
Then in various areas along the lines just inside them I drill holes large enough for the blade of the jigsaw to pass through. If your right handed put the hole closer to the right side of the top and bottom line and vise verse if your left handed.
Then continue to insert the jig saw and make the first cut along the top, having completed that put two pieces of tape across the cut and continue to cut up the left or right side putting another strip of tape on either side once the side is cut this is to hold the cut piece of steel in place once cut out and to stop vibration while cutting the bottom line. Now all cuts are completed remove the side tapes and swing the panel outwards on the top two tapes hold the panel and remove the hanging tapes, voile! You now have a rectangular hole in you sliding door.
The next job is gluing the premade wood frame to the back of the cut out, once the glue has gone off at this stage most folk would paint the raw edges of the cut out steel but my view is that I put enough adhesive sealant on the window seat so that it squeezes through over the top of the raw edge and covers it in anycase.
This is one occasion now where another person is required to press against the outside of the window once it's in place, so as to allow you to screw through the backing plate and pull the window snugly up against the outside skin, holding the window firmly in place. Once you have a screw in each corner your helper can leave the window and get you a large brandy to calm your nerves

. Go around the outside of the window frame with a paint cleaning wet wipe and wipe away any surplus sealant.