I have just worked on my suspension on my 147, it has been on the road 4 years and has done 88000km.
Even though I had all the wishbones and droplinks, I only ended up replacing the dampers and springs to Eibach Pro Kit.
All the bushes were fine with nearly no wear on them. I popped out the bushes in the upper wishbones and lubed them up good with silicone grease, and spray silicone oil on all the others.
My car had an underbody corrosion threatment (not sure this is the correct term), before I got it from the dealer, and it made a huge difference in getting all the bolts of.
Apart from getting VERY dirty with corrosion protection (tectyl), it was not a problem to get anything apart.
The only thing I had to cut was the rear dampers as I couldn´t get the top nut of, and I needed it for the new one.
So you might not need as much parts as you think, but it will vary depending on how much rust are one the bolts.