Worktop looks great, nice work! How do you find the accuracy of the Smartbench? I felt it was rated quite low compared to other CNC machines, even hobby ones (+/- 0.5mm).
I am in the process of making a kitchen right now and have a CNC (Steel Frame so rigid) and a Panel saw with scoring blade.
I started out thinking I would use the CNC for most of the cutting drilling etc but ran into the problem of size, my CNC has a work area of 700mm wide by 1500 long so to use it:
1. I first have to cut down the sheet material to fit on the CNC.
2. I then have to devise a way of holding the panel down while I cut it out.
3. I can not cut right through the panel without using tabs to hold it in place otherwise the panel moves all over the place on the final cut and the bit destroys the panel.
4. Using tabs and hold downs means I have to oversize the material in the first place so I can hold it in place while machining so wasting material.
After I cut the smaller top units out on the CNC I decided to move over to the panel saw for cutting the sheets to size which worked out a lot better. Then once cut to size I put them on the CNC to do the drilling and grooving which seemed a better way to use my CNC. If I had a ridgid 8' x 4' CNC I would probably use that for the cutting too as they produce a very clean cut when using the right cutter.
I would say 0.5 mm is way off for a CNC especially if you are drilling holes that need to be in the correct position and correct size. I had to upgrade my collets from standard chinese ones to AA and AAA grade collets because to holes were just not accurate enough for my kitchen with standard collets (The standard collets produced holes about 0.1 to 0.2mm too large which gave a sloppy fit to shelf pins etc). If you don't have good quality collets then the bits you use will spin eccentrically. I have had my CNC for about three years and only noticed the problem with the collets when I needed to be really accurate. For V carving and other stuff I never noticed the problem with my chepo chinese collets but I did when drilling holes for my kitchen.
From what TIMBRA has said 8'x4' is brill but I'd want to test one out first by cutting melamine panels and drilling holes in a few offcuts first, it's something to think about.
Mark