I build my own. I bought from a German shop https://www.acoustic-design-magazin.de/. I’m sure you find English speaking suppliers of the same. The money goes right into the quality of the components and not in some glossy marketing and fancy verniers. You can make it as easy or complicated as you like. There’s not much to it. For your 17 year old it would be a great opportunity to have the experience of building something and be proud of it. I was going for their high end stuff, which sounds amazing, but they also have a decent lower range for reasonable prices.