EEEK, Blue face is bad face, blue face is bad face, must get rid of blue face. Blue face is gone and as projects always, this tends to grow a bit. I'm building it for AR162b's Extended T75 frame as it just is more proper. Arctic model with double layer heated sand witch floor, insulated and heated cargo boxes etc. Completely out from my head. Not sure why blender is glitching, but it always does that.
You are, that is my 2nd ever thing in Blender You just need keys tab, w, e, x, y, z and mouse, tab to edit mode, select edge with right mouse button, hit e, then x, y or z, and move mouse, it is not so difficult, but difficult is to place edges right, keep them straight and polycount etc. Texturing and UV mapping is unknown to me and how to make model so that uv mapping does not become real pain, that I believe takes lot of practice. Getting rid of evil blue faces is done by selecting face, hitting w and then flip normals, if anyone needs to know, I probably read that tomorrow and find it as new information again I try to say that just do things in it and don't care if it goes wrong, then just do more things and then you get better at it, I just love failing, that teaches me so much more than succeeding without failing.
Actually glitching was because I set lens to 250 as I tried to see, but then I learned that I can keep lens at default and when vertex or whatever is selected I just hit dot from the numpad and I'm again getting close enough to see well. So need to add that key to most important keys in blender It is funny program, nothing really works as you except it to work as it works quite differently from standard Windows programs, but it might not always be a bad thing, frustrating, yes, but also can be quite efficient. Water tanks are supposed to be at that rear section, above storage boxes, haven't worked out volumes yet though, so middle rear storage box might need to be black water tank area. I'm starting already to sweat when thinking about creating jbeam structure.