Currently XCM emulator makes too much assumption about everything so that it is not generic and cannot be used for many commonly enough setups such as non u128 balance type or H160 account id type.

A large refactor is required to remove those assumptions and move all the code depends on pallet-balances to a separate optional extension. Not every chain have pallet-balances. Each chain may have different AccountId type and Balance type and they have to be configurable.