No.. everyone is using pipe insulation foam.. its already black. I posted wip images when I worked on mine... its at least a few pages back. Since you are doing much of what others here have done, go back at least 10 pages, and see what different people have done.. one method will appeal to you.
Also, you can just pop the thing open instead of cutting.. look at the posted pics of the innards, so you know where to gently apply the pressure until it pops the joints.
Also while its open, you'll want to open the battery covers, and then put them back (I used poster tack inside them to hold them in place better.) That way when the batteries eventually fail, you'll be able to replace them without tearing the whole thing apart.
The hinges I found were at Lowe's.. they are small, maybe an inch and a half wide at the most. (Instead of duplicating what I did, instead put the hinge on the inside, and the clasp on the outside.. it'll be slightly harder to put on, but it'll look better.
The Hud I did was just pleiglass, and the mount for it was just a small cut off clear tubing also from lowes. if you decide to add the HUD, check the scarp plexi lowes probably has. (You'll have to ask them.) They will sell that to you dirt cheap.
Someone else did the handle, but found that in use, it was very ackward, so he removed his the rest of the time. I opted not to add it because of that reason. This way I can still eat, drink, and shop comfortably with it on.