I think you could do it with only about 16-hours of shop time. Like already stated - you would have to have a firm plan of action.
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Note: They can really run up the clock with a lot of officious things - such as: a) having to wait to get tooling, b) having to wait to get tooling changed, c) having to wait to get underway while someone walks around inspecting your set-up. I am not saying this is bad - you want them to promote safety, it's just that "they can really drag out the process" something they obviously learned from the government (state, city, county, federal - alien intelligence - who care...)
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I would use about 8-hours for the wood cutting, routing and poly carbonate trimming (actually closer to six hours - but I plan for the inevitable "mistake" - which could take time to sort out). One time I was using a Table saw at an Air Force Hobby shop to cut relief grooves in a panel. I had to go to the tool crypt to get something and while I was gone some one cut a board (changing the was) - just a quick cut. When I came back with the new push stick (they require push sticks - and I was originally given one that looked like it had been pushed through the blade one time too many - but was assured it was OK - but it broke - hence the trip to the tool crypt), anyway, when I came back I did not notice the saw blade height change (because I was irritated that I didn't get a new push stick to start with) and watched the saw cut through my panel. Oops, that taint good. So I had to re-cut a whole new panel and do it again. The perpetrator came by and apologized. He told me that he would have put the saw back but didn't know what my setting was. He was only using the saw for one cut of a 1X6 board (He could have done "that" on the Radial Arm saw"). He figured I would recheck and notice that the saw wasn't correct and adjust it - but I didn't.
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My point is when using some one else's or a commercial "pay for time" shop, things happen. Pay attention ( a lesson I have already learned so well).
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I usually laminate the wood before I cut and Route - this can be done at home. As can the actual assembly (which would take another one-two hours of shop time - or at home).
The electrical would be another hour - maybe two (at home) , Installing the Monitor and Control Panel - another hour (at home), Putting the Control Panel Switches, Joysticks and Buttons on and Mounting it - another four hours - at home). It takes time to punch out the holes and then mount the buttons - most of the time punching out the holes).
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I don't fabricate my control panels - have them fabricated. I have fabricated them, but I do not have a roll/slip press, nor do I own a sheet metal shear. So for as little as $50-$80 I can have them fabricated. If I were into this full time I would have twenty to fifty blanks fabricated at a time and as I understand it they would cost me 50-70% less per panel blank. But I don't.
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Incidentally "I Am Looking For A Full Time Metal Fab shop/Person in Phoenix, Arizona. My regular shop considers this a boutique industry, the owner sees my passion and does it for me, but unless I am willing to do 50 to 100 panels he keeps saying "he would prefer to not make them" for me - but does any way. I smile a lot (I took my Niece with me once - He likes her Pamela Anderson Look and I guess he hopes I bring her back more often - but that is another whole story)...