phpschduleit - need to modify it

hello there i need modification in a web app called "phpscduleit" : [login to view URL] i think its written on drupal, im not sure, but i need someone who can give me the modifications that i need and in a reasonable price....i have more projects ahead so this could be long term if you are good and honest. shouldnt be more then 100 dollars!! the modifications are not big and complicated and are conected to eachother! its allready up and running on my server. so basicly what i want is this: [login to view URL] have 2 groups of users so that each one of them could have different accesories list the thing is that the accesories list is thesame for both but the second group has couple of other accessories. 2. when a user takes something from the accesories list, it should have one less.... now what happens is that that if theres ten for one room and you take 1 now you have 9 but the other rooms still have 10 its supose to be from one list of equitment..... and when the booking ends so the accessories go back to the list.... if after they took its 6 so when the booking ends its 10 again.... 3. reporting - to email and to pdf.... ask me anything, Ronen