Solid timber built ins

Slowly restoring our house and trying to use solid wood everywhere for a number of reasons. Quality, longevity, feel… basically not a fan of Mdf and laminex type products.
Looking to put built ins in the bedrooms. Obviously Austin cabinetry is $$ and even more so if you’re asking for solid wood.
We’ve found a few examples like this that look promising, but I’m trying to understand if the price on custom cabinets is in the materials or the installation? Am I going to do an average job putting this in myself, or end up paying similar in the end to have it installed? Basically wondering if I’m chasing false gains.

Other option is the folks on here who have gone direct to china for cabinetry. I can’t find much evidence or people getting solid wood options that way.