So, my head burns, but I don't give up. 
Yay!

A question: When 144 = әj, what would be 145? Not ɬәj = 145? 
ɬәjbɑ 10012+1
Because ɬәj would be the "0" on the next 0-99 chart (if the chart was expanded to go up to 199).
Be careful, that 12 based numbers. 012 - BB12 --- 10012 - 1BB12
Decimal: 010 - 9910 --- 10010 -19910
I know, but sometimes I just don't care enough to do the calculations and write it all out. 0-99 is easier to type.
I create an other table, may you can see, the 1000 steps would be better.

Hopeful no errors...
example*
hopefully**
*bangs fist on table* FORGET ABOUT THE LETTER G! *erases* THERE! IT'S GONE NOW!
You got it almost right except going from 100-200, 100 now acts as 0 because of the final digit. So 101 would be ɬәjbɑ. I think I said...wait a minute...=_= You forgot the ɬ column where the tens go (110, 120). So you would have to shift the g column all the way over and down one. I think you were doing that with the g column but...wait...
G COLUMN NO LONGER EXISTS!
0 1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23
...
108
120
132
-------------------------------------------------
144 145 146 147 148 149 150 151 152 153 154 155
156
168
...
276 277 278 279 280 281 282 283 284 285 286 287
-------------------------------------------------
288 289 290 291 292 293 294 295 296 297 298 299
...
420 421 422 423 424 425 426 427 428 429 430 431
-------------------------------------------------
432 433 434 435 436 437 438 439 440 441 442
You got it basically.
