Can anyone help me with a model placement system?

I am not the best with math or model placement and I am wondering if anyone can help me the this model placement system I am working on, right now this is in a local script, I want stuff to be placed server-sided, and I also want to use a module script, I know how to use RemoteEvents, and ModuleScripts just not sure how to convert this type of system though, I also need help with picking the model back up, I don't really know how to go about doing that, but if anyone can help it would be great, also please if you know anyway I can make this shorter, or easier to organize and go through please let me know, this script is in a text button by the way.

-- Priority Varibles
local placement = require(script["Placement (Module)"])
local uis = game:GetService("UserInputService")
local runService = game:GetService("RunService")
local rs = game:GetService("ReplicatedStorage")
local furniture = rs["Furniture"]
local remotes = rs["Remotes"]
local confrimPlacement = remotes["ConfirmPlacement"]

-- Secondary Varibles
local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()
local modelName = tostring(script.Parent:WaitForChild("Name").Text)

--Modle Placement Varibles
local node
local preview
local pp
local selection
local canPlace
local rot = 0

local placing = false


local function previewItem()
    if (placing == false) then
        return
    end
    if pp.Position.X+pp.Size.X/2 <= node.Position.X+node.Size.X/2 and pp.Position.Y+pp.Size.Y/2 <= node.Position.Y+node.Size.Y/2 and pp.Position.Z+pp.Size.Z/2 <= node.Position.Z+node.Size.Z/2 and pp.Position.X-pp.Size.X/2 >= node.Position.X-node.Size.X/2 and pp.Position.Y-pp.Size.Y/2 >= node.Position.Y-node.Size.Y/2 and pp.Position.Z-pp.Size.Z/2 >= node.Position.Z-node.Size.Z/2 then
        selection.Color3 = Color3.fromRGB(0,155,0)
        canPlace = true
    else
        selection.Color3 = Color3.fromRGB(155,0,0)
        canPlace = false
    end
    preview:SetPrimaryPartCFrame(CFrame.new(mouse.Hit.p+Vector3.new(0,preview.PrimaryPart.Size.Y/2,0))*CFrame.fromEulerAnglesXYZ(0,math.rad(rot),0))
end

local function cancelPlacement()
    if (preview) then
        placing = false
        preview:Destroy()
        selection:Destroy()
        node = nil
        preview = nil
        pp = nil
        selection = nil
        canPlace = nil
        rot = 0
    end
end


local function startPlacement()
    node = workspace["Harbour Studio"]["Node"]
    preview = furniture[modelName]:Clone()
    preview.Parent = workspace
    pp = preview.PrimaryPart
    selection = Instance.new("SelectionBox", workspace)
    selection.LineThickness = 0.05
    selection.Adornee = pp
    mouse.TargetFilter = preview
    for i,p in next, preview:GetChildren() do
        if not (p.Name == "Hitbox") then
            p.Transparency = 0.5
            p.CanCollide = false
        end
    end
    placing = true
    runService.RenderStepped:Connect(previewItem)
end

uis.InputBegan:Connect(function(input)
    if (input.UserInputType == Enum.UserInputType.Keyboard) then
        if (input.KeyCode == Enum.KeyCode.Q) then
            cancelPlacement()
        elseif (input.KeyCode == Enum.KeyCode.R) then
            if (preview) then
                rot = rot +45
                preview:SetPrimaryPartCFrame(preview.PrimaryPart.CFrame*CFrame.fromEulerAnglesXYZ(0,math.rad(rot),0))
            end
        end
    elseif (input.UserInputType == Enum.UserInputType.MouseButton1) then
        if (preview) and (placing == true) then
            print("Placing " .. preview.Name)
            local model = preview:Clone()
            for i,p in next, model:GetChildren() do
                if not (p.Name == "Hitbox") then
                    p.Transparency = 0
                    p.CanCollide = true
                end
            end
            model.Parent = workspace["Harbour Studio"]["Furniture"]
        end
    end
end)

script.Parent.MouseButton1Click:Connect(startPlacement)