I am going to try to make this build a little more detailed, hopefully a rough draft to make a CRL.
Like I said before, I started with the Head of IG88. I do not have access to a Derwent Flame Tube, but from other forums, I gleaned the overall measurements. I measured out his head and separated the Head into a several sections to help me break down how to design it. I think these are the minimum amount of sections you would need to accurately make IG88's head.
If you can see that, his head is broken up into 10 sections.The bottom Section #1 is not really part of his head, but rather his neck. Although the Derwent Flame Tube utilizes this section as part of the tube.
Section #2 is where we see the Large diameter holes appear. It overlaps Section 1, and has a small band that separates it from Section #3. It is not a pure cylinder because it increases in diameter as it approaches Section #3. It better resembles the bottom piece of a cone in that way.
Section #3 further increases in diameter as it goes up, similar to Section #2, but should be shorter in height (compared to Section #2. Although, its rate of diameter increase is about the same as Section #2.
Section #4 is only visible from a few shots, but as can be seen in this shot, it is stamped with many small holes. This image shoes the "white" light that emanates out of Iggy's head. It is a transition section where it is changing angle ever so slightly from Section #4 to Section #5.
Section #5 appears to not change in diameter, but I believe it does slightly. It is a very short vertical section.
Section #6 increases diameter rapidly, but is a little bit shorter than Section #2, and as such does not appear to increase diameter beyond the largest of Section #2.
Section #7 contains most all the "greeblies" and red lights. A Longer section that does not increase diameter.
Section #8 rapidly decreases diameter as it approaches the top of the head.
Section #9 is separated by a visible divet with some holes in it.
Section #10 proceeds from Section #9 narrowing towards the top of the head. It is separated by a change in the decrease of diameter towards the tip. The tip is not uniformly round in height, and from someone with a Derwent Flame tube, they said that is accurate, and that the tip concaves inward into itself.
Specifics for Each Section:
Section #1. Shall be relatively straight in diameter, and must fit within the rest of the head.
Section #2: Must have 4 large diameter holes equally spaced apart around its circumference, and must increase in diameter from bottom to top.
Section #3: Must not have any holes, and continue increasing in diameter roughly the same as Section #1.
Section #4: Must transition Section #3 with a round edge, and must decrease the diameter of the flame tube. It should have many holes in it only visible from above the line of sight of the Section #3. Roughly 20-40 holes must be in this section. It must also house the "binos"
Section #5: Should be mostly vertical with no hole in it.
Section #6: Should increase in diameter from Section #5 to Section #7 with no holes in it.
Section #7: Should be slightly larger in diameter than Section #3's largest diameter. It Should have 2 large holes for Red "eyes", 9 smaller holes for red lights, 5 small "greeblies", and 1 "scoped lens". Along with about 14 alternating slits near the top of Section #7, alternating with 14 other slits right above the first 14.
Section #8: Should have a "dome" transition from Section #7 to Section #9, and it shall have no holes it it.
Section #9: Shall start with a small "divet" as the transition from Section #8. There may or may not be a couple slits in the transition.
Section #10: Shall not be uniform in height and shall indent on top.