Wow... I tried all the stuff you said and you just solved every single one of my problems... and only a couple hours after I posted too... You're amazing and thank you so much = )
I use Windows XP paint to draw all my tiny models just for fun. Right now I've been working on an incredibly large one for the past couple months. It's basically a space ship, but imagine that the size of a single person is 1 pixel... That's the scale I use. Right now the "absolute size" is sized at 10000x6000 pixels. So just think of the scale if a single person's size as 1 pixel... It's a "blueprint style" picture (top-down cross-section, showing individual floors with individual floors and I've basically been drawing everything at 600%-800% zoom. I've even made my own "easy to read" pixel measurement system (ruler) that I needed to judge the size of certain parts. It's been a couple months working on it whenever I have free time (about 24-30 hours total), but I'm still working on the overall design (shape). I've been constantly resizing it again and again. The absolute size started off at 500-250 pixels, then 1000x700, then 2000x1500, then 4000x2500, and so on... So now I said screw it and put the overall size at 10000x6000 pixels just to be safe... Honestly however, I'm still not sure if it's going to be enough... It'll probably take me a few years working on it every now and then to finish it... Maybe even more since I'm so obsessive-compulsive about everything.
I'd just like to say thank you MadJik for answering all my questions perfectly and making it a whole lot easier. I'd also like to thank the creators of Paint.Net for having 100 times more options than XP paint.
I would've pasted a 50x50 and 120x120 image containing the top, side, and front views of one of a ground unit and one of a smaller ship (the scale still being 1 person = 1 pixel). However, I guess I can't copy and paste something on this reply. I could put it as my profile signature... but I'm tired after looking at a computer screen for the past 26 hours (1am yesterday to 3 am today) straight... That's mainly because I play World of WarCraft...