The consensus on letting your engine idle to warm up is idle only briefly say a minute or two. Warming up is a hang over from carburettor fed engines. Fuel injection & cats its better to drive away just dont rev it or let it lug, the engine will warm quicker under load. Cats need to be warm to work so long idles mean more pollution & waste fuel. Cold engines, rich mixtures & thinner multigrade oil mean your cylinder bores may not be fully lubricated so long idles could expose you to the risk for longer. Your transmission, brakes & tyres need to warm up as well & you need to move to do that. You are free to disregard all the foregoing.
The seat base should sit behind the angle, with new upholstery it may be difficult to compress the rear to get it seated. Consider putting a piece of wood 25 x25 mm or 50 X 50 on the front edge of the seat base to raise the front of the cushion. With long legs I find its more comfortable. If happy make brackets to attach to the base.
