Construct is mainly designed for 2D games, but it also provides a range of features that allow you to add 3D elements to your games. This tutorial covers the av...
"Use another layer to display the text, and set the layer render to 2d."
Go to the "Layers" window, select the layer, and on the left side under "Properties" you can apply 3d or 2d rendering to the layer. So you can make your HUD without any problems.