This is very similar to assembling any pcb, it's just a matter of putting the parts in the correct places. With stripboards I find it's best to build bottom up. That is to say the lower a component is, the higher the priority that it needs to be placed. This is especially true if you're not using a helping-hands and have to balance the board on a desk to solder it. I was this time so I started with all the resistors.

There was a section I had where I routed one resistor underneath another that was jumping a trace cut. Probably not the most elegant solution but it can save a couple rows, and make your life easier in the future when you have to figure out how to get it all to fit.

I assembled all of the passives without trouble and then moved onto the actives. I started with the transistors. My transistors are of dubious quality so I tested both of them before adding them to the board. Both tested around 200hfe. Which is good, but I've always found it strange that 2n3904's seem to pretty reliably make those numbers when the datasheet only calls for 30. It's as though the datasheet is just the words "it's a transistor alright".

I thought about soldering in the LM324 directly, but this time thought better of it which would save me in the next part.