Personally, imma be saying no to free build. Its a somewhat good idea but it will not play out well.
While some players would enjoy this, and i dont mean to be disrespectful, this supposed group is a minority. The most likely outcome of this will be people abusing the space. Making 'ugly' builds on purpose, griefing other players builds, and overall creating builds which aren't up to standard. Yes this can be moderated but it would be a enormous amount of work for the team having to deal with keeping everything up to standard, and frankly i can’t imagine anyone would be willing to volunteer that much time. Not to mention the amount of mod requests which would be made over disputes of land and areas used for builds.
Moving on from the player side of things, from an actual aesthetic point of view this is destined to look ugly unless every single player intends of using free build collaborates, which simply will not happen. The implement of free build will cause random builds to pop up everywhere with no collaboration, rhyme or reason. the server will begin to look messy and tacky with too many things going on at once in too small of an area. While rp is a priority, and should be, the builds and the looks of an area play into rp is often overlooked, and i believe it is here. People will not want to roleplay in an area that looks disorganised, cluttered, messy and so on. You need a good build for rp to prosper. And again, rp is the important thing here. this runs the risk of stifling that.
Tldr:
Will look ugly
People wont respect this power
Will cause a lot more issues and work for staff
may discourage rp