I did the same thing in the last house we owned. We had a build and design company who quoted us around $50K to remodel the kitchen. We paid them $100 for the design they came up with and parted ways.

We went to IKEA and picked everything out. IKEA hired a sub contractor and they came and installed everything in two days. We still had to do all the demo and prep for them, but we were able to get multiple discounts on everything we bought.

In the end, our tiny kitchen remodel went from $50K to $15K. We moved out about a year later, but all the cabinets and quartz counter tops were still in pristine condition, even after a solid year of use.

IKEA cabinets are usually considered one of the best things they make. Plastic layered MDF works really well for cabinetry for whatever reason.

Even most woodworkers seem to actually recommend Ikea cabinets, even if they despise the rest of their products.

With my knowledge as a non-professional woodworker, there's not a lot to cabinets. Even professionally made cabinets use veneered plywood for the bases so what IKEA does isn't any different than almost all cabinets here in the US. The US mostly uses 'framed' cabinets instead of European 'frameless' cabinets, but the cabinet box is essentially the same.

wood expansion is a big factor for wide flat pieces. Non directional wood products like MDF are used in cabinetry because they do not expand to anywhere near the same degree as solid wood. If you want to use solid wood you have to float it in panels, like you sometimes see on doors. But that adds a lot of complexity. For cabinets where you have dozens of moving pieces using MDF (or plywood) is much better for the reliability of the moving parts.