Current progress includes cutting up a sawboard to help me cut straight lines (my wordworking skills would still be classified as amatuer for sure).
http://forum.arcadecontrols.com/index.php/topic,43568.0.htmlWhile cutting the sawboard things were looking pretty good. I cut the first strip with the factory edge, then attached it to the larger strip to make the board. Unfortunately it was after cutting into the second board to get the nice straight edge I realised that the edge had a bow in it.
Either the factory edge wasn't straight, or it had bowed as I glued and screwed it down. After prying the piece off and resting it on the ground I realised I'd have to bend the centre in around 5mm to get it square. so I glued it back down and reattached each end to the base plate, used clamps to pull the center out 5mm, then added the rest of the screws in.
To recover from the bow in, I found a strip of pine wood the exact thickness of the mdf (18mm), and 11mm wide. This would work perfectly, so I glued and clamped it onto bowed cut edge and waited til it dried. After drying I noticed a few small gaps between the mdf and the pine, so I went the extra step of using some epoxy resin to fill them in and make sure that pine edge wasn't going to rip itself off.
Finally another 24 hours later, I ran the circular saw over that edge and finally had a nice straight sawboard!
This has now cut up around 1/3 of the pieces I need for the build, all nice and straight (although the circular saw appears to be cutting on a slight angle, so not quite perpendicular on the vertical cut, maybe 5 degrees out which I can cope with).
Note the second photo shows the board from around halfway where the pine is at its thickest, tapering away to nothing at the end.