Bicycle Mechanics - Am I crazy for trying this?

Being a lightweight, most rims and wheels are overkill strong for me. I was thinking about getting a set of older light weight 36h tubular rims with nipple washers and building them up as follows:

Rear: 18 spokes laced 3x on the drive side, 9 spokes radial laced on the non drive side (skipping every other hole)
Front: 18 spokes laced radially, evenly spaced if the spokes holes are not offset and paired if they are

That would make an older rim originally available in 32 or 36 hole drillings into a 27 spoke rear and an 18 spoke front. This would be for crits and some road races. At 140-145 lb can I get away with this, or am I asking for it?

Try it if you want but don't skip every other hole. Instead do the spokes in pairs with two adjacent holes and a spoke running to the two sides of the hub. This will make it so the side to side tension is balanced and that the bending torque is closer. Also I'd stick with the sort of angle you get from a 3 cross pattern but you won't be actually crossing them since you just halved the number of spokes.

Because you're halving the spokes I would do them crossed on both sides so you have more drive torque support. On the front radial may be OK but you're now halving the spokes which means more pure radial load per spoke. You may want to stick with the same angles that the old three cross gave.

It's a bad enough idea that I wouldn't run out and buy wheels to try this with but if you have them around already then what the heck.

The problem with the cross angles with a 36h halved is you get one spoke left out on each side (9 per side on the front). I suppose I could do a modified crows foot. I am assuming you suggest the cross angles in order to get more trailing spokes for torque on the rear, and more suspension for the front?

edit: And of course, the big issue on trying it or not is if I'm risking a wheel collapsing and a broken collarbone or just a broken spoke and a cab ride home.