Wow, thanks for introducing me to DonorsChoose, I had no idea something like this existed specifically for teachers and classrooms!
I did approach many major companies for funding (such as Google, Apple, service provider companies etc) but was not able to get any help from them. I think one of the major problems I faced was lack of connections; I merely emailed the support/outreach department of these companies because I did not know anyone who worked there or had influence there, which I think was a reason for the disappointing responses I received, some even half a year after I originally emailed them. My only sources of funding were parents in the community and local companies.
Absolutely. My plans for next school year include aligning VR completely with the curriculum, even for science and humanities. Examples of VR expeditions integration with science would be an expedition to the insides of lungs, explaining step by step the workings of the respiratory system.