How would I recreate a building tool that can place blocks?

Greetings fellow scripters, I'm here today wondering how I can make a building tool like stamper build, but to place blocks in FE. My goal is to recreate build to survive zombies, with old roblox materials as textures. Why I want to make this game is because it was a really good game back in the time. Anyways, here is my script. It can't use the Z; most likely because I haven't explored a certain thing required for me for this script.

Tool:

script.Parent.Activated:Connect(function()

local mouse = game.Players.LocalPlayer:GetMouse()

local X = mouse.X

local Y = mouse.Y

local Z = mouse.Z

print(X,Y)

game.ReplicatedStorage.BuildObject:InvokeServer(X,Y)

end)

ServerScriptService:

game.ReplicatedStorage.BuildObject.OnServerInvoke = function(X,Y)

local block = Instance.new("Part",workspace)

block.Size = Vector3.new(4,4,4)

block.BrickColor = BrickColor.new("Brown")

local t1 = Instance.new("Texture",block)

local t2 = Instance.new("Texture",block)

local t3 = Instance.new("Texture",block)

local t4 = Instance.new("Texture",block)

local t5 = Instance.new("Texture",block)

local t6 = Instance.new("Texture",block)

t1.Texture = "rbxassetid://155806200"

t2.Texture = "rbxassetid://155806200"

t3.Texture = "rbxassetid://155806200"

t4.Texture = "rbxassetid://155806200"

t5.Texture = "rbxassetid://155806200"

t6.Texture = "rbxassetid://155806200"

t1.Face = "Front"

t2.Face = "Back"

t3.Face = "Bottom"

t4.Face = "Top"

t5.Face = "Left"

t6.Face = "Right"

block.Position = Vector3.new(X,Y,0)

end

I'm quite sorry for the messy code above.