Is it possible to do the following to a kit car

1. Extend the height of the roll bars by having an extra section welded on (proffesionally etc) and rough ideas of cost and who in the Herts/beds area


2. Extend a steering column to give greater knee clearance by cutting and sleeving then welding with a gash cut into each end of cut column does it impact the steerinig in a negative way

3, Take the sub frame of a cobra seat and bolt directly to floor i think this is easy and safe