Forget all that, it's all old redundant technology, 10-15 years old+
The TDI tuning scene has moved on since PD150/GT1749VB turbos and T4 injectors, with a ropey remap 'to suit'.
Spending 3 grand on old stuff, which is a mild upgrade in power at best, is a waste of time, effort and money IMO.
There's a saying that you shouldn't build a car you can buy.
That said, if you want a Cupra or FR TDI spec car, sell your 110 and buy one, as that's what you'll end up with, and selling a Cupra/FR is easier than a modified 110 (or a standard 110 + parts + labour costs to remove the mods again).
If you wanted to really put that 3K to good use & see what proper power is about, you'll need the following:
A new GTB1756VK turbo with TIG welded manifold+flange for £730
PD150 turbo hose £50
Get R520 injectors for £270
Pop testing+calibration for injectors £100
11mm injection pump £500
Southbend SBC Stage 2 Endurance Silent SMF clutch £600
2.5-3" downpipe and decat £150
Get Mark at Malone Tuning in the USA to send you a FlashZilla remap device, and he will email you new remaps - he is one of the best TDI tuners/remappers in the world and his maps are much better than current UK ones, around £400 (I forget exactly).
Total £2800
You'll also need uprated engine mounts to avoid wheelspin and an uprated intercooler (either a larger SMIC or a FMIC), and a PD lift pump could be good too for higher revs.
Add labour, and the extra bits, and it's not that much more than 3 grand, but the money is a LOT better spent, and you would really appreciate the power difference, plus you could sell those newer technology parts a lot easier than outdated stuff.