Hello , We are fully capable of building your OS ,although you don't seem to have attached any pdf , I assure you that we can build your OS with whatever specs and requirements you want , maybe even better , so please contact us via PM to give us your requirements
But ,if I may say , you're asking us to build a custom OS from scratch , and you probably want it to have the capability of many OSes (well that's the main reason why any person or organisation would like to make a new OS ) ,so you can't offer us the same price as if you were buying a ready made OS that has already been in the market , we would ask for half a billion pounds (this is highly negotiable) and we can get your OS done in 120 days (four months)
please contact us via PM with info or for negotiation , we are waiting for your PM ,
looking forward to working with you,
Yours.