Ethereum Integration

I have a betting system and it uses just Bitcoin to deposit/withdraw funds.
It was configured with Bitcoin node.
I know it is possible to use Ethereum node but it mayby takes several GB on ther server.
So I want to use web3.
If you are expert in this field, apply with reasonable proposal.

Note: I have decent expertise in Blockchain since I have ever worked as Web Developer.
Thus, spam bidders will be reported!
Only experts with 'Ethereum' title! :)
Thanks