Inspired by Gannu_1's
thread, I decided to install gas struts to open the hood in my Linea T-Jet.
The first step was to take some measurements and decide on the brackets that need to be fabricated and what struts I will need. As most cars have two struts on either edge, I also decided to have two struts. Even my boot lid has 2 struts rated 390N. Here is how the calculation is done.
The extended length of the struts I was looking for needed to be 430 mm to 440 mm. Based on Gannu_1's experience, I contacted SGS Engineering, who came back with a quote of £18.64 per strut. Add to this the shipping cost and possible customs, the project was turning out to be more expensive than I would have liked.
So, I did some more research and realized that the Grande Punto has 436 mm Magneti Marelli struts to open the hatch lid, rated at 350 N, with a 170 mm stroke length. The cost was just ₹ 904 each. Additionally, the GP also had a screw type ball pin on the hatch, while the ball pin on the body was riveted in place. So, I will need 4 of these pins to go on either end of each strut. These pins were available for ₹ 78 each. So, I was looking at ₹ 2350 - for two struts, 4 pins + shipping from 99rpm. Went ahead and ordered these.
While I wait for delivery, decided to design the brackets to fit the car. The Linea hinge screws are on the side, so the bracket does not have to be bent.
The bracket that goes on the body will have to be bent at 90*. Shared my initial design with the guy who was getting it done for me.
Decided to get these brackets laser cut in 2.5 mm stainless steel sheet, then get it powder coated in matt black. Also decided to use M8 stainless steel bolts with stainless steel nylock nuts. No rusting issues. Peace of mind.
Since the laser cutting shop needs the drawings in a specific format, these drawings were made and finalized.
This goes on the hood
and this goes on the body

It was Monday, the 21st Dec. The courier brought in the goodies I had ordered from 99rpm. It is always thrilling to receive car parts. My guy who was helping with the laser cutting and powder coating called up and told me that the industrial area was closed on Monday - due to load shedding holiday. So he will be able to give me a quote only on Tuesday. I was disappointed, but it turned out to be a blessing in disguise. A friend who owns a Punto also wanted to get it done and we had to take measurements of the Punto and then make sure that the brackets originally designed would fit that as well. Turned out, it wont. So, it was back to the drawing board to redesign brackets that would suit both the Punto and the Linea. While we were at it, we decided to make one hole in the bracket that goes on the hood an open ended slot, so that one screw will only need to be undone partially. We also made 4 holes in the bracket that goes on the body, to have flexiblity of the fixed mounting point. Here is the outcome of that exercise.

After fitting on the car
Short video of the struts in action