Flaked wheat is already crushed enough. No need to grind them down any more. Rice hulls are a good idea.
Also, no need to boil anything. The 152 mash will be plenty to convert both the barley as well as the flaked wheat.
For a small mini-mash (ie, 3 or 4 lbs) this procedure works great:
1) Get a stainless steel spaghetti pot that will fit in your oven when covered.
2) Heat up 1.25 quarts for every lb of grain that you have (total - ie, 2lbs of 2 row plus 1 lb of wheat means heat up 3.75 quarts) to around 170F. Use a thermometer to be sure.
3) Pre-heat your oven to 150F.
4) Add your grain to the pot and stir it all in to eliminate any dough balls.
5) Check the temp. You should be right around 152F give or take. Check with at thermometer to be sure.
6) If you are below 148F, add a little extra (an oz at a time) hot water.
7) If you are above 155F, add a little extra (an oz at a time) cold water.
When you are happy that the temp is stable and right at around 152F give or take, cover the pot.
9) Turn off the oven (that's important) and put the pot in the oven with the oven turned off. The heated oven is so that the whole thing cools down more slowly than it would if you were doing it at room temp.
10) While this is in the oven, heat up a similar amount of water to 170F for sparging (aka rinsing).
11) After about 3/4 hour, take a teaspoon sized sample of the wort and check it for conversion using a couple drops of iodine.
if the iodine turns black/purple, it's not ready because there is starch present. If the iodine doesn't change color, it's converted and that means there's no starch left. (Be careful to only get wort, not grain chunks which will present false positive color changes). Throw the sample away -- iodine is a poison
If it shows starch, let it sit longer and try the test again in 15 mins. Repeat until the iodine test shows conversion.
12) Use a colander, strainer, or nylon bag to strain the wort into your boil pot. Rinse with the sparge water to get more of the sugars out and into your boil pot.
Top up to your boil volume and proceed with your boil as you would normally do an extract batch.
HTH-