Depends... I have not made a complete BOM yet, and some of the custom parts (mainly the transformer and mechanicals) will be very dependent on where and how you get them. It will not be cheap if you have them custom made. I had a single set of PCBs made here at a supplier I know, but for one-off quantity the PCB would have cost me €100 at regular prices, which may be rather steep. A 225VA transformer (the type that you should use for this design, the one Liv used is actually a bit underrated*) easily costs €50 new, and you will still have to rewind it.
On the other hand, if you can use an existing enclosure with a scrap transformer and cooling you can save a lot of money. I will check if I can get the panel I now ordered here in Europe made cheaper in China (which is quite likely), but the PCBs in a panel are about 150x200mm, so the surface area will count in the final price. I will disclose this information as soon as I have it, but at this point I did not do the boring administrative work yet.
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)
What kind of budget are you on?
*edit: I think the design has a derating system for higher voltages.