This thread has me confused. I just started to buy afv so it may be just my newness at it but,
Chuck
Cdc, I usually don't post here but your question has pulled a string in my heart. You seem new to WW2, you have certain criteria for what you want to collect, and models are too expensive now to be buying outside of your criteria. So let me offer the following:
What Katana says is generally true, but could use some further refinement. There is a large scale fig, that being the K&C, TCS, & TGM brands. These go better with the larger scale brand AFVs which are generally, K&C & TCS. K&C uses a sliding scale. They make their smaller vehicles truer to large scale (1/28+ or even ++) and larger vehicles closer to 1/30. Some of the older models of the Witmann Tiger generation can even be found in 1/32 scale. TCS is also a larger scale, and generally come out 1/28 + or even ++. TGM, which copies the K&C fig scale, make their vehicles close to 1/30 which means that some of their smaller vehicles look rather strange with their figs.
FL, Figarti , most TGM and some ED hover around 1/30 and go better with FL, WB, KP & WP figs.
Keep in mind that FL can run 1/31-1/30, while Figarti can run 1/29-1/30, which means there will be differences between those brands.
Every model from every manufacturer has it's own unique scale. I don't think any model I've ever measured has been 1/30 or 1/whatever in every dimension. For example, off the top of my head, the FL Tiger came out to 1/30 in deck height and chassis length, and 1/31 in width. The Figarti Tigers came out over 1/30 (perhaps 1/28.5 iirc) in height, but were 1/30 in length and width. And there is a similar story from every model from every brand.
I usually don't read and post here, but you can reach me at the HB forum. We have a thread there dedicated to scale requests. I may not have the exact model to measure, but I have the line drawings for nearly everything of major interest for WW2 and Cold War. You can post a request over there if you want some scale information. With luck, I will have the model to measure. If not, I can post the dimensions for chassis length, deck height and width at 1:1 scale, show you to points I measured, and you can repost the information over here for someone to compare (who actually has the model). I also have measuring instructions over there posted for people who just have a simple ruler rather than professional calipers.
I generally use the Bradford diagrams for reference, and I do check for drawing distortion from the scanning/printing process (usually a 3% error). For German equipment I double check against Hilary Doyle diagrams as he is an engineer who has actually measured the surviving vehicles (as some government supplied drawings were found to have errors).
Hope I am able to help you. Offer goes to anyone else who wants the help.
What I can help to avoid are unnecessary argumentative scale threads like the Figarti Pershing thread for example. That thread should be no more than 4 posts tops, but you can see how this subject can get out of control.
You want the data...I'll give it to you, you can post over here, and anyone who has the model can follow some quick measuring instructions and give you a high confidence answer.