[dsraven]

those lennox metalmaster discs also work well. like a thin zip disc except they stay the same diameter because they don't wear down in size. just ensure you wear eye, skin and breathing PPE either way. lots of stuff floating in the air after using either style so if you can cut safely outside without starting a leaf fire or something the go for that option. portable bandsaw would be a great option too but maybe out of budget for some that have a disc grinder already so could save a few bucks by using that.
like said above, the kits already account for those time consuming things like building bumper and running board mounts. if you got time and tools it would be up to you. if you wanna drive it soon, same deal. frame swaps are time consuming unless you have done one like it and have the dimensions and engineering figured out already. joedoh, skymangs and hussy make it look easier than it really is. its a trade off, time for money. if you don't have time or money I hope you have beer to drink while you "bench build" (it's like bench racing).