Here is what I came up with to help everyone with the back breaking job of getting the shingles on the roof.
Before you start you must read and understand about your power tools. wear safety glasses . the project is powered by 110 volts this voltage can kill or severely injure so take precaution for your safety and others that are around you when you work.

I have been using a carvewright cnc to carve my dxf patterns out of wood its slow work .
I belong to a makers goup and I can expose a lot of people to a huricane laser cutter a lot of them want one and you never know how many of them will buy one.
as for me a laser would cut the wood at least 10 times faster and it would decrease the time it takes to make a 3d printer.
my wife would like to cut her cloth patterns out quickly and easely espesialy the fabric that frays a lot.
cut leather, cut conductive fabric, cut foam,and I can come up with many more uses but I have to keep it short.
I would like to try cutting an egg for my fabrige eggs. make wood or a metal rulers when I get in a pinch it would be a lot faster then going to the store and save a lot of time.I carve wood plaques with ukranian designs that I was giving away as gifts.
it would be a breeze and finish one in no time instead of a week or so. Nohttp://youtu.be/q5FOIcd7nwgw to get the laser to paint it for me.
video http://youtu.be/jWosC1Rj2Jo http://youtu.be/GB5nVP1irjA http://youtu.be/q5FOIcd7nwg

100%

Step 1:

Here's what you need
1) 1- 2x12x12ft or longer (depends on your roof)
2) 2-2x6x12ft
3) 1=2x4x2ft (for cross-members)
make a rectangle with 2x6 and 2x4s
then nail or screw it to the 2x12

Step 2:

it should look like this when done.

Step 3:

next you will need a garage door opener.
you can find one at your nearest Eco-store if you don't have one then look for ads in the paper or garage sales
worse comes to worse buy a new one. its still much cheaper then buying a ready made roofing escalator

Step 4:

on the end there is a place where you can screw gdo (garage door opener) to the board
and put a couple screws next to the railing so it does not move side to side

Step 5:

next find some small wheels mine are from a conveyer. and a couple small 1x2 s some screws to hold the wheels on the wood

Step 6:

you need to get a piece of plywood a little wider than the shingles and just as long my first carriage was to short and it would not stop at the top after I made it longer it stopped every time
1 pcs plywood 14x.1/4x39
1 pcs 2x4x14
some screws

Step 7:

screw or bolt the wheels to the 1x2
then place completed assembly on the plywood so that the wheels stay on the long ramp

Step 8:

there is a slide that is connected to the chain it has a plate with some holes in it
on the carriage mark a center line and drill a hole for the bolt
and bolt it to the plate then get a small piece of wood for a rudder that goes on the carriage to guide it between the rails
once you have this done mount to the long board attach the wires and switch to the garage door opener and you are ready to go and test it.
enjoy the back saving conveyor.