So this is what I am looking at for the 'core' of the design and then cut purple foam for the 'lifting body' look of the design.
This is the image I think I can match, which I think is the Assault Triumph rather than the original-
But it works with the parts I have and will give a lot of detail.
You can see a metal Battlemaster and the Lance Pack box & Cyclops to judge scale- could not find my yardstick. The purple part is where the sealed opening for the formula is located, I need to remove the peel on 2 more that I washed out but I grabbed some I had not started on to make this visual example. Others are being used for mechbays, ASF/SC hangers and vehicle garages. Might do some of the others with building up around one to make a ammo dump bunker.
After looking at a few things, I think I will use brads to pin the 4 containers together with liberal applications of superglue. I am also considering some balsa wood to help form the frame underneath along with plastic coke bottle caps to form wheels though not sure what they will connect to as landing gear to the frame. Problem for the rest of the frame is I have not found a good angle to get a look at what the stern looks like.
I have a pair of these bottles to form the engine nacelles along with some of the caps from baby food pouches to be accent work for the intakes since the bottom part is concave. The opening where you drink from would be the nozzles for the thrust. I am thinking of using the spray foam inside the bottle to reinforce the juice bottle's structure.
For the nose I have a mini Nilla Wafter to form the structure of the nose and I will probably get a styrofoam ball or something to round off the edge of it. Half a foam ball will let me score it like its taken damage.
I also have ping pong balls & cheap plastic christmas ornaments (Dollar store!) to cut up as turrets. Or just mount left over MWDA weapons for the 'guns' the Triumph would have trained out.