Yes, those capacitors look fine.
That diac is good but as I said in post #29 the circuit you are working from is designed to use a neon bulb, which has different characteristics. If you copy the component values from that circuit but use a diac instead of a neon, you'll probably find that you can't dim the bulb all the way down. That's why I suggested looking for a different design, or reusing the components from your board.
As for construction, it's such a simple circuit that I would just use "skeleton wiring" - start with the large parts, and just solder the smaller parts to them, using their own wires to support them. You can also use glue. This assumes that you'll be enclosing the whole thing in potting resin or similar. You can't have things moving around and touching each other!
BTW in post #17 I suggested "potting mix". I should have said "potting resin" as in post #5. Sorry for the confusion!