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Good Afternoon @sunsaro100
Installing benchtops is something that I am cautious of 
Mainly because when I did my last kitchen it really sank in that walls are not always square as you would expect. So cutting a miter cut of the bench Id be stressing to get it right. @JacobZ's suggestion of bench installers might be the way to go if you want to stay with a miter cut.
As an alternative workaround, how about straight Butt styled cuts. You still join the benchtops with the clamps/biscuit joins but using straight edges. Less chance for a mistake.
Dave
Thank you, Jacob and Dave, for your prompt responses. I initially visited a place that offers reasonable prices on benchtops, but they charge $400 for mason mitre cuts, which is $200 per cut. Other places I checked are quite expensive and are unwilling to provide a detailed breakdown of their quotes. Therefore, I'm considering purchasing the benchtops without the mason mitre cuts from the first store and handling the cuts myself.
Since I already have the router and the necessary bits, I only need to purchase the jig. I have also bought benchtop tightening bolts and bits for making holes. The "Trend" brand jig is available for $242 in a suburb near Melbourne. I have both a table saw and a circular saw equipped with new 80-tooth blades. Most quotes I received range between $1,050 and $1,200. If I do the cuts myself, my total cost will still be less than these quotes. Additionally, I can resell the jig for half its original price.
I have a couple of concerns. First, I wonder if my cuts will be as precise as those made by a professional. Additionally, as Dave mentioned, my kitchen walls are not completely square. If I cut the benchtops to size based on my measurements (please see the attached diagram), I might make a mistake, especially with the centre piece. If that happens, I will need to replace it with a new piece that is cut correctly. For the two side pieces, I plan to leave extra margin on the ends before making the final cuts, so I can avoid having to replace them in case of errors.
Could you please share your opinion on my idea?
G'day @sunsaro100
"Since I already have the router and the necessary bits"
One forum I visited suggested testing the router and bit (30mm?) on scrap first. Some people have found the cut is not a perfect 90 degrees.
This site...
https://semble.com.au/what-to-know-about-mason-mitres-for-your-kitchen/
... seems to be suggesting the mitre on the right of your drawing should be running with the cooktop bench?
Well, I wish you (@sunsaro100) every success with your endeavor.
I also wish I had your gumption 10 years ago. I was disgusted with the bench-tops we purchased then - very expensive 'plastic' covered chipboard.
Recently, before she became unwell, my wife was a keen baker and wanted a larger oven - an extra 200 mm on what he had. I kept telling her I was more than happy to rip off the current bench-top and reduce the sliding drawer component by 100 mm each side and replace the bench-top with Bunnings SpecRite Boards .
Just cut and butt join. I wouldn't give two hoots for the joint appearance now.
No 3 HP router.
No 30 mm router blade.
No template.
Too late now.
But I will see what life throws at us.
Good morning @sunsaro100
We pay for what we get is the saying that comes to mind. Every time I thought I could "do a job cheaper" it has ended up costing me the same as the quote Mostly because I was in unfamilure territory and needed extra tools, material or just outright mistakes. I would strongly suggest to go the route of the professional cuts. They know what they are doing, they have been doing it for awhile and you arnt paying for their tools or time, you are paying for their skill. For a job that is viewable for years to come, makings ure its done to your satisfaction would be high on the list.
Dave
