There are a number of tricks to using a router. First, the bit spins in a clockwise direction, as you look down at the router from the top. This means that when you cut with the router from left to right, the bit will tend to pull the router away from you, and when you route from right to left, the router will pull towards you. So, if you're hooking the edge guide along the near side of the board, route from left to right, and when you're hooking it along the far side of the board, route from right to left. Second, always test the position of your bit on scrap material. Your odds of getting it exactly right by eye are nil. Third, don't cut more than 1/4" deep on a single pass. We want a 3/8" deep grove, so make your first pass at 3/16", or thereabouts, and make a second pass to reach the full depth.
I marked the holes by putting a dowel center in the end of a long piece of 1" dowel. Run it through the holes in the base plate, and bang on its end with a mallet. Rotate it a bit and bang it again, and repeat. Odds are the dowel center won't be precisely in the center of the dowel, so you'll be making a small ring of marks. The center of the hole is, of course, the center of that ring.
You may even want to put yourself in the picture. If your workshop space already exists, find a large piece of cardboard, wallboard, or plywood that’s about the size of the workbench top you envision. Find a couple of stools or chairs, perhaps a few books, and turn them into stanchions to support the “benchtop.” Is it too big for the space? Is it large enough for the tasks you envision will be performed upon it?
Even with all of those faults my only regret is that it is too ugly. I didn’t take the time to make it more visually attractive as I was eager to get right into making beautiful furniture instead. Twenty years later the furniture is still beautiful (or not) but I go out to the shop and look at a drab uninspiring workplace. Yeah, nothing wrong with having a visually inspiring workplace in my opinion. All that shop furniture I slapped together years ago with no concern about aesthetics is getting replaced bit by bit. Why should my shop be downright ugly when it is one of my favorite places in the world to spend my time? I see no reason for that, but that’s just my opinion and as we all know everyone has their own one of those… Sadly, no one pays nor reveres me when I offer mine. bummer, I could be a rich egotistical maniac if they did coz I sure offer it enough. 😉
I thought my first wood working bench was great.A heavy c channel metal frame with a recycled maple floor top with a guick release 7 in vice on the side.It is about 40in by 54in and can hold a hemi no problem. I waxed the top till it was nice and resistant to whatever was dripped on it. Only problem is I was thinking like a gear head not a wood worked.Work piece would slide and no decent clamping on the sides. I figured if I wanted to get somewhat serious about this woodworking thing I needed a real bench not a table with a vice. I read the books and with so many choices I chose a Roubo split top from Benchcrafted it would let me use it for both power and hand tools. I just finished it a week ago and it is nice not to have to chase my work across the bench. I couldn’t find a clear answer for a top coat for the bench I chose to leave the soft maple nude. So I guess I have a bench tbat has a lack of modesty.