Blinds – Installing Roller Blind in Window Ingress

Ok, I did the metric to inches conversions so I understand the size of your project. Sure wish the USA would go metric like the rest of the civilized world. LOL.

Your bench is going to be apx 7 foot by 2 foot with 17 inch overhangs. I think you will find that a solid stable material like 20 mm (3/4inch) plywood, medium density fiberboard (MDF) or solid boards will work well if the load is not too heavy. Avoid materials like cheap chip or particle board because they have a tendency to warp easily if not secured to a sub-straight. Because the surface is not real smooth, they don't look great when painted.

If you want to be sure the unsupported overhangs don't curl or distort, you could frame under the exposed sections with an extra parameter rim of say, 2 to 3 inch by 3/4" solid stock mounted flat under the overhang. This would effectively make the overhang 1 1/2 inch (38mm) thick.

Use a good grade stain blocking primer and finish your project with a couple of coats of quality enamel paint.

You need to worry about not just the weight of the blinds, but also a weight slightly greater than the blinds focused at the string when the blinds are pulled up. I'm going to make up some numbers, but if you had a blind that was 10lbs, you would see maybe 7lbs on the left bracket and probably upwards of 20lbs on the right bracket (assuming string on the right) when they are lifted. The weight of the blinds plus friction is going to add up.

I have some 6' blinds and haven't measured it, but it takes a lot of force to raise them. I normally lift them with my free hand as I pull the string, but my wife isn't that "nice". There's also some lateral force if you're not pulling straight down and when you have to pull sideways to unlatch the mechanism.

Any pull force listed on the magnet is in a purely perpendicular force performed in a lab. They are very, very strong, but I wouldn't trust a "working load" with that listed weight. You're going to get a stronger hold from a mechanical fastener like a screw or bolt.