Some of the issues I've noticed with this layout:
*Not easy to learn for existing QWERTY typist, and not compelling for Dvorak typists to switch
*It's not very good on finger distance
*ZXCV aren't kept in place (yes, they are mirrored, but it's not the same)
*Common letters such as O and R aren't on the home row
*The little finger has to do a lot of corner reaches (M, L)
*It puts rather frequent letters (. and F) on the long reach positions (B and Y positions on QWERTY)

Your response is very thoughtful and thorough, thank you. I will attempt to address each of the points you raised.

While it's not aimed at QWERTY typists, I think you have a strong case about it not being compelling for Dvorak typists. Since Dvorak is a good layout to begin with, it's not reasonable to shift as many keys around as with a redesign of qwerty. Do you think it would be better to move only seven keys 7 keys?

This still cuts the same finger rate a bit for English and keeps it about even in German...I wonder if Dvorak was optimized for German and just happens to work well for English too.

',ouy fgcrl
kaeip dhtns
;.qjx bmwvz

It's about 6% worse than Dvorak but I wouldn't say it's bad. Especially considering the work (travel and effort of pushing the key itself) is not factored into the distance.

Since I'm not targeting QWERTY users, I figured proximity trumped placement, though leaving them in place might well be better.

I thought the ideal home row for letter frequency was hsao  etin, so to include R I'd have to type with my thumbs☺
But I moved O because my index and middle fingers are about 33% faster than my little fingers (440 vs 330 cpm for my right hand and 350 vs 250 for my left---My index and middle fingers are about equal, as are my pinky and ring fingers).

Unfortunately, I forgot QWERTY three layouts and four months ago and I don't know where to find key delay data for typists, but I'd guess that most QWERTY typists can type 'ie' faster than they can type 'a;'. And if you have a link to such data, please share.

The only reach that really bothered me was QWERTY 'Z' and '[]-=/' (but it hasn't bothered me since I moved 'z' to the left shift and '[]-=/' to alt-gr keys).

I left the 'L' as is because it didn't bother me when I typed in Dvorak some years ago¹. I think that may be because 'L' isn't frequently used with 'R' or 'N'. And I think I prefer using my pinkie on the top row to using my little fingers in sequence as with QWERTY 'as'.

¹(I reverted to QWERTY because I used public terminals a lot and I didn't know how to translate between layouts at the time.)

Still, I prefer to AVOID using the little fingers as much as possible. And the layout I'm learning now only has 'gcz' on the left pinky and 'bpk' on the right. But it has to be learned from scratch. And I'm tyring to come up with something that would be easy for a Dvorak user to learn.

For QWERTY and Colemak users, I think something like

qfuwg jloyb
rsatd hneip;
zx,cv km'./

might work better.

I put the period in the corner because²...dohh...because my QWERTY B is on V...heheh and that left half is the mirror of the right half of the layout I'm using so umm. Good catch.
It should should have been:

myou. fpgrl
wiea, dhtsn
kjq'; bvcxz

²(coronors are a good place for periods because that is where a sentence ends).

But going back to your first point, it's probably best to minimize the number of keys moved.

I left 'F' where it was because it never bothered me when I used Dvorak and it would be one more key to relearn.

Again, thank you for your consideration.

As a former Dvorak user myself, I really think that the best option once I realized its shortcomings was scrapping the whole thing and going Colemak all the way. Your board doesn't really improve on Dvorak enough to make it worth the while and if you're moving from Dvorak why not do better? I don't miss my Dvorak the least bit.

When I switched Dvorak->Colemak the period of confusion wasn't long. After that, I felt the benefit of my old QWERTY training assisting the Colemak learning. A purebred Dvorak typist is a rare beast indeed I think? Thus, most typists would be better off either sticking with Dvorak or if they're enthusiastic about going a step further, switching to Colemak.

The advantage of using Colemak over Dvorakoid layouts in conjunction with the inevitable QWERTY sessions (since I'm not allowed to use my USB stick everywhere, hehe) is real and should not be underplayed I think.

Absolutely! If you look at the layout that you just posted, and compare it to colemak, you'll see that the majority of the vowels are on the right hand, on the home row, or both!