Thanh85

You'll need to replace the loom with the original look and ecu. You will also need to put the original injectors into the new engine as they are different and cannot be coded to the original ecu. 

I can tell you that they have the 1GD engine but know nothing about the DPF.

You can unbolt the l sports bar and remove it. I can't see why a canopy can't be fitted. If it's all standard from the top half imo.

If you have never had the seats done then you may be able to get it done under warranty at a dealer as we did a few of these for a little while. If not your symptom does seem like the seats leaking but Techstream won't show you anything about the mechanical leak. Easy way to tell is If you drain the oil and there is evidence of carbon on your oil pickup. Should be done at every valve clearance inspection (every 40k service)

If your car is still in Warranty I'd take it back to Toyota and present your receipt. If you fitted it yourself it'll be hard to get your money back. Tell them what happened honestly and they may help you out. Otherwise there is not much else you can do about it.

A workmate does not have NAV but you can option it. They do come with reverse camera. GPS does not display with Bluetooth either. Hope this helps

There's a little contact on a spring that wears out. Just add some soldier to the contact and it should be good for ages. Also clean and lubricate the contact point on the back of the steering wheel too. I'd recommend a tiny bit of Vaseline on the contact surface of the steering wheel 

You don't need to remove the rocker cover when doing a water pump or belt. Just the plastic cover on the front of the engine. There is a special tool to hold the cam gear but I've used the old belt to redo the bolt up ok. Make sure you turn the crank over twice and recheck timing marks  after you fit the belt. These are interference engines and will mash valves if out. Hit me a pm if you need any more help.