Yes it is still being worked on. Just very slowly right now because of real life stuff.
Would be great to hear where the problems are.
I'd be happy to share them. The issues I noticed within it were the following:
1) Sib, Pri, Rus model_3 has issues, some units are 2 levels higher than they should be (1952 skin should be model_3_3 but is set for model_3_4, all higher skins are similarly affected)
2) Guy, Saf, Ast model_5 has issues, all units are 2 levels higher than they should be (1939 skin should be model_5_0 but is set for model_5_2, all higher skins are similarly affected).
3) Gre model_7 skins are one level too high (1931 skin is set as model_7_3, should be model_7_2)
4) Skin for Model_7_8a should be model_7_9
5) Csa model_9 is four levels too low (1931 is set as model_9_0, should be model_9_4)
6) Cal model_10 is two levels too low (1928 is set as model_10_0, should be model_10_2)
7) Jap model_13_16 should be model_13_14 (the skin is for 1954, 13_16 is for 1962)
8) Model_17 has multiple issues of wrong SKIFs being assigned
---------Sov, Sib, Rus, and Pir model_17_3 has a SKIF that has the number 1924. Model_17_3 is supposed to of the year 1922
---------Eus and Ita model_17_10 has the year 1950. Model_17_10 is supposed to be the year 1954. Additionally, both skins are just the same SKIF from the interceptor class for either nation.
---------Can, Eng, u07, u16, Eus, and Ita model_17_11 are of 1954 CAS. There is no unit above 1954 CAS, and model_17_10 is the 1954 CAS.
9) u10, tex, u06, u15, u32, usa, u21, u23, u22, u17, sco, tex (in the optional files), sib, fra, pri, and vic have skins that are labelled model_26_9. Including nuclear, there are only 9 aircraft carrier tech levels. Model_26_9 skins (marked nuclear) should be made model_26_8
10) model_21 has issues in that super-heavy battleships are improperly marked (superheavy II gets applied to superheavy I, superheavy nuclear to superheavy II, though I believe this is a development of the 1.04 update, not entirely sure).
And that's all I personally noticed. Only other issues I can think of was that the USA factions have the Lexington-class carriers in the image for CV-2 and Ranger in the image for CV-3 even though the Lexington-class ships are supposed to be CV-1s and the Ranger is supposed to be a CV-2 based on the classes in the tech tree.