Ok here we go some of the strip down is simple and I have used a couple of previous posts from other sites to show various items as I forgot to take photos in my haste to swap parts.
Seats
First was to remove the seats - Nothing complicated here there are or were 6 hex bolts holding my seats down and I used an allen key socket to undo these. Its part of a set I use on my bicycle and proved handy for the job. The passenger seat had been removed by JAZ when they bypassed the immobiliser to get the car started but the technician must have used a power driver as a couple of the bolts had been mangled. I eventually got these free. Drivers side there are two electrical connections to undo one from the seat switch and the other from the seatbelt fixing. Passenger just has the one connection from the switch. I found the easiest way to remove the seats was crack off each hex then remove the front screws first slide the seat forward and then remove the rear screws - note remove your seat belt anchors from the seat I left mine on and had a spare pair with the new interior or so I thought. they did not fit over the lip of the seat fixing as they were obviously from another Porsche. when that happens the new high bolster seats won't lower as the seat belt anchor fouls the tunnel.
Lift Seats out - phew, blimey they are heavy.
Door Panels - Got this detailed photograph I think from Pelican and every thing is pretty straightforward except carefully releasing the electric window switches and the junction box that will vindictively come undone and empty all the wires before you have chance to photograph them. A few hours later squinting at wiring diagrams and following the memory position the wires were in - all back and working and if anyone gets in the same problem I have photographed the wire colours and positions.
Photo courtesy of Pelican - This shows screws you need to remove and popping off of trim fixers.
This shows the location of Hex bolts 5mm
Only other point is before you undo the hex bolts move grab the metal lever behind the door hand le lift up and back. When refitting remember to line up the opening in the plastic collett before replacing the metal hook
Dash top
This is fairly easy other than getting the main fresh air vent out to get to the bolt holding the dash in.
First undo the screws along the top rail then the two hidden beneath, unscrew the plastic covers at either end two further screws beneath. Take the vent out by levering down the two metal clips at the top of the vent and pull out - initially i thought it was hard but then I hadn't done the two side vents so in comparison this one was a breeze

Removal of your dash is fairly easy. First, remove the five phillips screws that hold your front defroster grille, remove grille, note the two that hold the dash io located behind as they need to come off. Next gently pry off the plastic endcaps that are on each end of you dash. After the caps are off, remove the phillips screw that is buried in there (use a flashlight to locate it)
Next the air vent don't listen to anyone about removing the clock (well on a 993 anyway - 964 may be different) on the air vent you will notice two metal clips at the top on each corner? You will have to get two levers plastic preferably and pull the tabs down to release the teeth that fix in to the dash - see picture. Then and this gets amusing with your third hand pull the vent forward.
Where the vent has been removed there is a nut to the right which is not as some suggest finger tight unless the dash has been previously removed I managed to get an 8mm spanner on then a socket undone by hand. When this is off and if you have remembered to go back to the dash top and undo the two phillips screws you can now gently pull the dash outward and up, the stud has to clear the sheetmetal.
Pull the top dash out - simples
What I did find useful was the blown up diagrams on Design 911 and Rosepassion as you can see the fixings and I ordered a number of screws and cup washers for the doors.
Phew that is it for part one hope it is helpful and I will cover the rest on another post.
Mike