Hi Antonio
Regarding the roll cage chop.
Remove the rear upper section of the roll cage, loosen 4 x allen bolts at the front of the cage uprights, the front section will then naturally lower itself to the correct position.
NO CUTS REQUIRED
From the rear top section of the cage cut out the centre support taking care not to damage the horizontal braces and grind the excess material/welds from the tubes.
The two sections of angled tube that intersect with the top and lower horizontal braces need to be cut out. (Look at the photos closely you can see the welds), save these pieces as they need to be cut and re-used.
Re-fit the upper section of the cage, you can now see where you have to make the two outside angled pieces and the two centre pieces fit, its quite a simple fabrication job.
On my cage I TIG welded the new pieces into place and left the welds (no grinding off).
I also added the front brace to the cage for a little extra added strength.
It's very important that the cage is fully aligned before welding.
Once it's all welded it's off to the body shop for painting.
The roof fits back on perfectly other than drilling 2 x holes to fit the rear roof bolts that need approximately 30mm spacers/extensions.
Happy days good luck, I will see if I have any more pics of the work in progress.