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I did that to make the side bearings but because I found the plywood at work I only had 19mm and 9 mm so my options were limited. I did end up using more of the 19mm because of the weight needed to balace the scope. I'm converting a 10 inch F7.3 so I had to play around a bit with the box to get the torque equations close. As in Berrys book. My mirror, mirror cell and box were not enough to balance the telescope so I had to use two layers of 19mm plywood. Berrys examples only start at 15 or 16 inch mirrors. The weight of the secondary cage also made my job a little more challenging. I managed to get it down to 2.5 kilos which is not bad considering I didn't ose Kydex plastic. I'll post some pictures of the project soon. It's nearly finished just the the secondary pole connectors to go, align the primary box pole holders, put it together and cross my fingers that I did the maths correctly and the thing balances.
Regards Cristian
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