Blender Bezier

Add > Curve > Bezier

Go to your Z axis so you have a top view

Switch to edit mode and select all

Switch to the curve pen to make your curve exactly how you want

Remember, you need to select the end point first and then select the curve pen for each curve

If you need to reduce the sizem Click Data Properties and reduce your resolution 

In Object Mode

Convert to a mesh by right clicking and select Convert to > Mesh

Add the skin Modifier

Click the proportional editing objects button until it turns blue

You can hold the G Key and mouse scroll wheel to change the size of the radius you are editing

Change the thickness to your liking by holding CTR + A and left mouse button

make sure you have everything selected in Edit Mode

Switch back to Object Mode

Make it permanent by clicking Apply in your modifier

Switch to Edit Mode

Select all

Go to modelling

Play with the Spin Tool

If you are getting gaps, click on the panel in the bottom left (Adjust Last Operation panel )

Adjust as needed

If you need to reduce the size, you can always use the decimate modifier