Jamie By your question I am assuming that you are looking at 'handmade' or 'bespoke' kitchens. The frame (stile and rail) of the door is usually made of solid wood and many cabinet makers (including Norm from the New Yankee Workshop) use veneered panels for the centre of the doors. Veneered Ply or MDF is more structurally stable than solid wood, but IMHO can never be a true replacement for solid timber.
If the doors are butt hung then they use butt hinges (ie the type you get in household doors) and have a more traditional appearance to the MFI type method which use Euro hinges and doors are set on the outside of the carcase. This is a matter of aesthetics of what you prefer.
There are many companies, as eluded to already, who claim to do handmade or bespoke kitchens, but who in reality are merely buying in componens from companies with CNC machines. While the quality is often excellent in these products, I do fee they have a cheek saying they are handmade and charging the prices they do.
The cabinet chose is most critical. MFI and the likes use Laminated chipboard. Some people use veneered MDF, others Ply and others build in solid wood. Whilst I will sometimes build in solid wood, I usually use marine grade ply for this purpose as this give the desired strength and stability to last a very long time and put up with any future dishwasher/washing machine leaks.
I personally make drawers using dovetail joints, but this is not necessary and you shouldn't be put off a kitchen just because it doesnt use this method. It is time consuming, very strong and very aesthetic, but there are many other jointing methods that give more than enough strength and are much quicker to produce.
Finally runner chose is also important. These can take some abuse in a kitchen. Its worth looking at the runners on your chosen kitchen to assess whether they look substantial enough.
Hoping all this helps Calum Sabey (Newark Traditional Kitchens 01556 690544)