well.. i think your going along the right lines, but its really much simpler than that or can be.    as long as you are using mhrb, you can go straight to base.  ie skipping the entire acidifying stage.    the hardest and most important part is grinding up the mhrb.  thats important to make sure you get all the magic out.      the steps are like this.    grind mhrb.    put mhrb in a nice extraction vessel (i like big empty pickle jars)    pour enough HOT (read was boiling a few min ago) distilled h20 into the vessel to cover the mhrb dust.    make up a base solution in another container/measuring cup. strong basic solution. lye is your best friend on this. koh also works for this purpose.  nothing precise is needed, just a strong basic solution.    start slowing pouring in basic solution.  you will notice a color change.  it will go from pink to dark purple when you get the right ph.  once its all turned purple add just a bit more basic solution and mix it up.    pour in a nice 1/2 inch or so layer of vm&p naptha or shellite into the extraction vessel and mix it up real well.    wait for it to seperate.  if you did this all quickly while everything is still pretty hot.. it will seperate pretty quickly.  some people preform the entire extraction in a hot water bath.. this not only aids seperation, but allows more dmt to be gotten per amount of solvent.  the idea is naptha is a temperature specific solvent for dmt.  at low temps it isnt very soluble at all, at high temps its very soluble.  keeping it hot allows for more magic to get taken per pull.    siphon off the naptha/shellite layer and put in another jar.    repeat adding naptha/solvent, shaking, settling, syphoning 2-3 more times.    take all your collected naptha, and you could either straight freeze precip or reduce in a hotwater bath (crockpot w/ the lid off the jar and a fan blowing fumes to prevent pooling works for me.)    i prefer to reduce the amount of total solvent, then place it in the fridge or freezer...  if i went fridge first ill let it sit there for a couple hours, then into the freezer.    then after a day or so, decant off the naptha/shellite, turn jar upside down over something collective (like papertowels inside a tupperware that your jar is sitting upside down in) then after all naptha is gone, you just scrape and enjoy.    it ommitts the filtering, and the acidification, and gives you a great end product.