i have no problem building guns from parts kits, i'm even working on designing a couple rifles of my own from scratch
as for the hakim, i'm not all that familiar with it, i like the FN49, i love the M1 garand and in fact im a big fan of enbloc clips as they can often be reloaded faster than box magazines and are pretty cheap and lightweight to carry.. i've already determined for certain i'll go with 8mm mauser over 30-06 for the fact that 30-06 rifles can be converted to 8mm mauser but often the opposite cannot be done and im also a big fan of the early 20th century german stuff.. the FG42 being one of my favorites of all time and by extension that makes the M60 my favorite LMG of all time so theres a lot of reason for my to go 8mm mauser.. so i will definitely be stocking up on 8mm ammo at least to some extent
but.. would this be the cartridge i grab in any situation?.. i dont know, its ballistics are really not all that much better than .308, not when you consider how much lighter and more compact 308 cartridges are and how much more efficient is in smaller.. the mauser shines in some of its hotter loadings, you know, the more modern ones that far exceed the early 20th century cartridges but then youre looking at a ton of recoil, bigger, heavier magazines, longer actions, and longer barrels
so to me it doesnt seem like an intelligent idea to make 8mm mauser my #1.. it will have to be #2 or #3 but i will be collecting guns chambered for it and stocking up on ammo
__
this leaves .308 and 7.62x54R as my #1.. the VEPRs and PSLs are OK and realistically my only option for 7.62x54R.. i was thinking of designing a lighter, more compact 16 or 18 inch barreled carbine that took 47rd DP28 pan magazines loaded from the side underneath a top rail but again, im not sure how long x54R will remain cheap, if new EOs or arms treaties will end that source of ammo or not..
i have a mosin nagant but to be perfectly honest i dont like it, its ergonomics suck, its very uncomfortable to hold, because of the rims the stripper clips are never able to hold the cartridges tightly together like they do with the rimless stuff, so loading from stripper clips is unreliable, barrels on most MNs sucked and were 2 MOA capable at best with decent ammo with no good source for replacements.. i'm not a fan of the mosin nagant, im not a fan of rimmed cartridges, the ONLY thing i like about x54R is being able to get dirt cheap, high powered, steel core ammunition in large supply