1. Stock hinge pins won't work, as they're shorter. You need 46mm hinge pins for reversible suspension arms.
2. If you use 1A suspension mounts, yes. (that'ts setting of XV-01TC) If you already have 42mm, you can use 1XD mounts, which are narrower. Also if you have stock XV, you can use front wheel axle and 42mm dogbones.. Personally I prefer dogbones on rear axle, as they don't rattle that much at higher suspension
3. Tamiya site says, that standard XV01 swaybars don't work with TC. I can't say, I don't have them
4. once I get home, I can make photo of my TB03 with suspension modded for 25-30mm. Basicaly you need to get rid of downstops (bad, if you want to ride tarmac afterwards) and you need to make space for C-hub inside of front arm.
5. Tamiya's suspension mounts are in line, differed by letters, from 1XD (narrowest) through 1X, 1A (middle) to 1F (widest). One letter apart means 0,5° difference in rear toe. So for 3° you will need for example 1XB front and 1D rear.
Separate suspension blocks serve as 2 blocks at once, when you flip them you'll get same block with X (A-XA, B-XB etc). I hope I described it well
6. I hope it's all, but I forget about hingepins, so I might be wrong
Now you can hate me even more
When I think about it 70$ is still pretty expensive, I never thought that conversion costs so much