The First Steps:Grab some reference pictures. The pic of the onos at the start of this thread, and opening the alien5.mdl (onos) in Half-Life model viewer works well. That’ll give you a place to start comparing your 2d card to the 3d thing itself.
[I am building my onos fairly erratically atm, snatching hours after work, just shaping any piece that I can cut out, but I don’t think you want to start with a leg here, a horn there, etc. So I’ll try to go from the head inwards. I’ll update as I figure out which pieces go where.]The basic idea is simple:
1) Cut out outline and tabs
2) Score greylines and fold carefully
3) Glue the piece together, then look for other pieces to connect to itWe’ll start with what I’ve done with the head:
Look at the reference pics of the onos and find those teeth on the printout. Unmistakeable.
There should be one upper jaw piece that’s all teeth, and two big pieces which include the lower jaw and part of the head (left and right sides).
Step 1:Cut out the upper jaw piece. Carefully, goes without saying. All along the outlines and the tabs.
Step 2:You should have noticed there are some very faint grey lines on the piece itself, making up the triangular faces of the model.
We want to score these. Scoring means to make a very very light cut along the line. Do NOT cut through it. (not unless you want to play 3d jigsaw with triangles and scotchtape).
Some of these lines can be obscured by the dark-colored onos skin texture. Make your best guess as to where the lines are, and score it. I’ve noticed all form triangles.
This is painstaking work, but stay calm and patient.
You then want to gently fold along all the scored lines and form a 3d shape.
For the upper jaw, you should notice that as you fold, one tab on each side (in between the flaps) seems to slip naturally under the textured bits.
(The other two tabs on the sides proper are for connecting the upper jaw to the rest of the head.)
Test the fit by folding it without glue. When you’re satisfied…
Step 3:Apply your glue on the tabs, and connect the jaw together. Hold them in place until the glue dries.
It may also help to rest one surface against the tabletop, and press the glued-up tab against that surface with something long and thin, like a pen or screwdriver. Your mileage may vary. Whatever seems easier and looks good to you.
In the end, you should have a curved upper jaw shape.
Hooray, celebrate, try not to think that you’ll have to do this all over again for all the OTHER pieces!
Heh heh. Ok, now repeat steps 1-3 on the other two shapes you’ve cut out. Left and right sides of the head should start taking shape.
There’s one tab on the lower jaw that’s for joining both sides of the head together.
Notice there’s a gap above where the lower jaw is...that, oh...seems to fit the upper jaw! (Duh.

)
Glue upper jaw in place.
My model’s jaws overlap, I don’t know if yours will as well. So anyhow, decide for yourself if the onos looks better upper jaw over lower, or the other way around. I doubt it makes a significant difference.
Celebrate again. You should have something that almost looks like a bit of a head at this point.
Now scan your printout again and look for the onos’ unmistakable (if small) yellow eyes. They should be found on one long piece connected to the bony bits. Cut out that piece, score, fold, yadda yadda.
Figuring out how this piece joined to the head was a little tricky. First I found the fit for the eyes, but couldn’t figure out the top part, then I thought I’d glue where the eyes were first.
(Imo, if you don’t know where a tab goes for sure, leave it alone and don’t glue it yet until you figure it out.)
Then I somehow turned the head upside down and didn’t realize it, and couldn’t fit the piece for the life of me while the glue happily dried. Oh well.
By comparing with the reference pics, as far as I can guess, the top part where the bone is, forms a raised ridge.
Glue together, and yay, you have more of an onos head.
I’ll see if I can get a pic up some time to show this in more detail, but hopefully this should get those still nervous about the model started. As long as you do it carefully, and take your time, you should get the hang of it and catch on.
The scoring and folding step is very important, the more care you spend on it, the better your final result will look.
Don’t be too nervous to just give it a shot. After all, what’s the worst that can happen? You ruin the page and have to print out a new one. But you got some practice in.
P.S. This is written from memory, so I hope it accurately describes the tabs you’ll find. I’ll check later.
I’ll add more later as I figure out how the horns and stuff fit together.