Old Mobo is a trove of parts !
I think the best advice I can give you here is to be creative. Nearly every thing you need to build is thrown away today somewhere. Take the stuff you are tossing out and examine it in a new light. Can you use some of the parts in later projects? Or are they just looking useful with no present application. You gotta be a pack rat to some extent and this will conflict with beauty and cleanliness, so, again, be creative (and neat, where possible).
Look at the Mobo above. It has connectors, sockets, capacitors and a huge quantity of those tiny electronics components. With a little butane or propane torch you can remove a bag full of parts in an hour. Don't worry about damage from heat as they are free anyway. If there are some precious ones, keep the heat brief, brush off the parts with a brush or taping the mobo on a hard surface to loosen them. To get the parts with pins in holes, you must have the mobo mounted and pull the part with a pliers on one side as you heat from the other side. On occasion a good solder sucker might help.
I recommend putting the parts in named bins when possible as it gets very hard and time consuming to find them later, so use the time now.
Along these lines, old cases, tools, and almost anything needs to be considered for its value as parts. I keep the cases as not only a new holder of a project but as bulk material to cut up and use to build a special part.
I took a flat screen monitor apart and got speakers, micro switches, tiny amps, and a heavy stand. I thought about using the monitor screen for LCD experiments but figured I would likely never get there and tossed it.
I save nearly every computer power supply case because they are small, have switches, connectors, power cords, fans and other parts that are all needed for small projects, especially ones you want to put in small, sturdy (and shielded) cases.
Taking things apart is also a great way to learn how things are designed, how they work, how you might fix them and just plain learning how to do things you never thought you could do. Many things that seem irreparably broken are in fact easily repaired when you look inside to find loose connections, broken parts or simple burned out fuzes. Do not be put off by No User Serviceable Parts inside.
On the other hand, be cautious. Anything that uses high voltage to work needs to be discharged before fiddling with the guts, even after days of being unplugged. A simple brute force method of safety is to ground a wire brush (with a wire) and brush every thing inside, to drain the charge.
Remember to look at the parts as sub assemblies before chopping them up foe sub parts. I got a nice little audio amp module from the Monitor mentioned above that I kept rather than cut up for the smaller parts.
Be creative. Think Cheap.