Lagging the inlet pipe is an option, however if it does get hot it will heat up the inlet air inside. While it is on the same principle as ceramic coating, you can not get the lagging on the inside of the pipe to stop radiated heat where as the coating you can. Another cheaper option is to get a bit of Samco hose to use in it's place. Will also keep things looking tidy if you are into that. I also had a look at your pictures again and notice that you have not closed in the area underneath your shielding. Would pay off to make your filter fully isolated since you have gone this far with making it.
With the throttle body, I would leave it be as they are plumbed in for a reason. The area of your throttle body is only fractional compared to the entire intake system. With this bit being the only thing left to transfer heat to the incoming air, I would not be worried if I was you.