Hey Don I went to your website. Nice job for sure. I noticed some things you might be interested in. This is the differences between the current repro and the original that I found.
Looks like you have addressed pretty much everything. Except like you mentioned the thickness of the center cross line. And also the distance of that line is lower on original from bottom of lettering. And maybe a little more space between the apostrophe and the R. Nice!!
Ok here we go...
# 1 - The C in caution is cut nearly straight down and does not roll over. In fact, each cut of the C is tapered back a few percent.
# 2 The top of the T cross is shorter on the original.
# 3 The O on caution on the original is rounder, and not oval shaped. And that goes for all 10 Os
# 4 There is more space between each letter on the word C a u t i o n. Also that C in that word is cut back like the others.
# 5 The three horizontal lines on the E in the word Vehicle are the same length. Your center is shorter. And that goes for all 23 of them.
# 6 The cross run thru line on the Q of equipped goes thru the letter into the center and is cut straight horizontally.
# 7 Hard to tell from the picture, but all the periods look to have more space showing between the last letter on the originals.
# 8 Horizontal center lines on all F are shorten on original.
# 9 The G in Ground and Though has no right side down tail on original.
# 10 The Dash in between Trans - Mission is lower, fatter, and longer on the original.
# 11 The apostrophe on Owners has more space between the R and the S on the original.
# 12 All lettering AND numbering has more white space between each letter, and INSIDE
How did I do??