Advice and critical remarks regarding the manufacturing of a DC-DC step-down converter
Regarding components sourcing: just put in an order at Digikey, Mouser, or whatever mail-order supplier you prefer. Your local shop may not have 1% (E96) resistors, but if you order them, you can get whatever you want. And you can get the correct inductor too. Also note that the datasheet has a nice table of suggested part numbers.

Some notes regarding your layout:

Read the datasheet carefully, then read it again. Some things that stand out:


the datasheet shows which traces should be kept short. Follow these guidelines!
your inductor connection crosses under one of your feedback resistors. The datasheet instructs you to not do this.
adjust your layout so that your diode, input cap, and output cap are as close as possible to the regulator. Your cap layout is alright, but your diode could be much closer (the feedback resistors need not be in close proximity to the regulator).
a ground pour (if not a ground plane on the bottom layer) would be advantageous. I'm not sure why you're using a single layer design, but there's no cost advantages for a one-off.
those big electrolytics may have too high of an ESR, paralleling lower-ESR caps is a good idea. Output ripple voltage is directly proportional to output cap ESR, hence you should do your best to reduce ESR; paralling capacitors is an easy method.


Again, almost all of this is in the datasheet, you simply need to read it carefully. Also, you can make this work with all through-hole parts, but if you're willing to switch some parts to SMT, you will have a more compact layout as well as improved performance.