Hi,
here's a supstitutions list:
SFH2030 --> any photodiode (or a phototransistor) should work. It is best if you choose one with IR wavelength
TIL38 --> any IR led diode will work
CA3140 --> this is, according to specs, a "BiMOS Operational Amplifier with MOSFET Input/Bipolar Output", so you could technically use any such operational amplifier. If you do so, you might need to change the PCB a bit... Here are a few supstitutions: NTE7141, CA3053
As for the putting-it-all-together part...well...I can't help much. You could aks a friend to make this device for you (or only a PCB, if you prefer so).
My advice is to test it first by building it on a proto-board and see if it works the way you want it.