Isn't it crazy how hard it is to assemble a Space Marine army set in M41?
To get something that combines the current scale of 40k, with the old style mixed-armour pieces of Tactical Squads during M41, you really have to go out of your way.
Heresy Mark VI is a good start. Then it's a case of combining armour elements from the current Tactical Squad, Infractors/Tormentors, Space Marine Heroes, Red Corsairs.
The hobbying required to pull this off is admittedly, really enjoyable. But sourcing the parts costs an arm and a leg.
It's far easier to collect an army set in either M31 or M42.