except that the kind of "marxism" that they tried to implement in Russia and elsewhere (honestly, China and later are reinterpreted "Stalinism") may well be quite contrary to what Marx actually envisioned.
First off, the envisioned a nation like Germany, that was heavily industrialized via capitalism, to be the starting point. Not Russia that at the time was mostly still agrarian.
Also, he did not envision centralized state control. More likely he envisioned worker run factories and such. That is, the board room was not filled up by shareholders and venture capitalists, but the actual workers of the factory, bank and so on.
So in essence the transition would be form a capitalist run work environment to a worker run work environment. That is, the workers would be working for their own benefit, not some suit and cigar overlooking it all from a posh office.