Now maybe and maybe not.
Often it takes MORE time to adapt something that doesnt quite fit, than it does to start from scrathh.
I have severl 'units' in my kitchen that are in fact hand built, using h pre-made doors to match the flatpack ones of the erst of the kitchen., and whose carcase is non existent..either side of the Aga there was an alcove, brick faced. I screwed an oak wood frame to the alcove, built a base and a plinth out of oak faced MDF, and scrap wood where it didnt show., and attached the hinges to the frame. The tops are granite. Didn't even bother to attach it. Weight and accurate fit means they never shift.
In other arts of the house there are MDF carcassed cuboards using either pre bought doors, or oak T&G, and stock 'kitchen unit' hinges. I had to buy a recessing tool for those, that's all.
A Glued screwed and braced carcase is a very very quick thing to make - quicker than those fiddly quick-lok things. And MDF is tougher than cheap chip. The only problem is facing the edges that show with something decent.