A general BOM to reference has been prepared to aid with the build:
250EQ general BOM
When parts are out of stock, alternatives will be added to this document that are direct replacements.

On top of the raw DIY kit you buy from here, there is just one other order to make:

• You will need to order the remaining parts from Mouser. A Mouser cart has been prepared... 250EQ Mouser Cart
Should come to around £86 (If it doesn't...confirm with the 250EQ General BOM above)
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The above assumes you have some basic tools:
Soldering iron, solder, small screwdrivers, small needle nose pliers to get in hard to reach places to tighten nuts. multimeter to test circuit.