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dst2-
Only in that there's no real construction required. If the ground is flat enough, just chuck em down. If there is some fettling required to make it level, you'd have to do that regardless of what you use and 6x4 isn't going to take much effort. The plastic ones I've found to be a bit brittle. Either the sections themselves or the tabs that interconnect them, are easy to break. Timber laid straight on to the ground will A) need to be constructed (cut and joined) and B) will rot away in a short space of time. Slabs would be what I'd chose, but that's just me.
stevo_com
Used paving slabs. Ebay, gumtree, FB marketplace