another505 wrote:then unfortunately it is not designed like the strv 103
able to move up and down and rotate to traverse the gun
No - the Chimera was not an S-tank design.
The S-tank (as we called it in the UK), has a very low "L over C ratio" - that is to say, the ratio of the track length on the ground to the width between track centres. If it is much below 1.1 to 1, where the length and width create a "square" on the ground, the vehicle can be more easily skid steered than one that has a higher ration where the track is longer. The advantage of the latter is that the vehicle is more stable traveling at speed and it can cross wider ditches.
The square ratio means that you can achieve small adjustments in traverse (or "line") relatively easily and with less power than a conventional track layout. The S-tank also had variable height suspension needed for the elevation of the gun - and that had to be designed in from the start. The hydraulics have to be very good to give the sort of aiming precision needed for long-range shoots. (You could of course had a vehicle where the traverse was provided by the track and elevation by a conventional gun laying system - although that would have left another hole of course.)
Don't forget that we were working from what was essentially a Chieftain base with a few add-ons that were in UK service at that time - the suspension came off the Challenger 1 tank that had entered service in 1983.