process 3
1. get the materials -- aluminum sheets
(an industrial workshop is really cool, isn't it?)
2. measure the length of the waffle shape. draw an appropriate shape on the metal sheet by marker. then cut it. 
tips:
watch out and make sure there is not another foot(yours or others) under the machine. otherwise you may have to pay for the hospital for yourself or others lol.
tips:
do not cut your fingers. do it slowly not in hurry. i am pretty sure this machine has the power.
3. using tools in the workshop(mostly, hammers......) to bend it. make a dome-like shape to cover the waffle shape first.
tips:
a: clean the edge that you cut preventing you hurt yourself when holding the metal sheet.
b: do not hold the hammers too tight
c: watch out for the other sharp objects on the tables in the workshop
d: if possible, wear a pair of glove.
follow these tips, you may feel better than me in the workshop lol.
(if you really hurt yourself, go to the first aid box at the entrance of the round house. really helpful. )
e: watch out the edge of the metal sheet. preventing it from overlapping or cracking.
(this is my first attempt, you can see there is a lot of cracks on the edge. yeah that is a failed one.)
(when creating the dome, use the hammer hit on the middle. then draw the appropriate contour of the "dome". after that, use the "V" shape hammer hit it round and round and round and round......yeah, learn and exercise at the same time and do not forget the tips above or you will need the first aid.)
4. use small hammers to adjust the metal dome to your waffle shape.
5. use the tools below to create the sunken parts of my shell. then use small hammers to adjust it and clean the surface.