I have made & fitted a number of kitchens over the years and would only consider making cabinets where they are not commercially available from any of the trade suppliers. I'm actually going to fit out an extended utility room and adjoining store within the next couple of weeks and will be making a couple of extra deep larder type cabinets, to store garden furniture cushions.
The supplier I use (CPC - Cookstown Panel Centre) supplies standard cabinet sizes plus the full range of Egger board MFC. They also supply stock cut & edged panels 2800x650 which are very useful for making custom cabinets as the edges are already finished with the same pvc edge as the carcasses.
https://www.cookstownpanel.com/stock-cut-panels/c-5125.html
NB.Prices are heavily discounted at the point of sale.
My advice is to identify a non standard cabinet in your layout and try making it first. That way you can decide if making the entire kitchen from scratch is worth the hassle.
Use a decent track saw and not the DeWalt setup. When you have a cut lined up make the initial cut about 1mm deep and pull the saw backwards. That means the blade is breaking the surface in a downward direction. Use this as your scoring cut and then cut the board normally. This will minimise chipping and give you the best finish.