As mentioned above, Bayonet strength is OK on theoretical platoon structures, for the Red Army you need something like The Red Army Handbook.
However, most infantry platoons after any sort of period in combat ended up roughly the same - a couple of dozen blokes with some support weapons organised into three (sometimes four) sections/squads. Those sections would normally have one light machinegun or heavy automatic rifle (in some units like panzergrenadiers or fallschirmjager, two LMGs). There might be a light mortar at platoon level, or a mortar/MMG section at company level (or platoons of such at battalion level).
Complications arise in those armies who decided to equip whole sections/platoons/companies with SMGs or Assault Rifles, plus the allocation of disposable AT weapons (mainly panzerfausts, but also AT mines, molotovs, sticky bombs etc).
Most armies had also given up on subdividing their sections into gun and rifle groups, although the very late USMC experimented with squads of three fireteams each centered around a BAR.
For most armies, from a wargames pov, you need a small platoon HQ, three sections led by an NCO with some sort of LMG (BAR/MG42/Bren/DP) and 'some' riflemen (say half a dozen, possibly more) plus a few higher level support weapons.
Cheers
Martin