First I open the fusion 360 and upload my inspiration photo as Canvas file:

•   I started with the face that will have T- slots, first I create a component and title it with "mobile holder".

• Then I created skitch and used the rectangle tool to make one having 70*70 mm .

• then I started to make the T-slot by making two small rectangles, one with 2.4*5.5 mm and 3*8 mm and then make them collinear with the mid point of the line.

• I made also two rectangles on the outside surface of the shape with 3*10 mm  and both of them were far from the inside rectangle 5mmm from the both sides.

• then I take a copy of that slot and paste it in the other two sides m so finally I'm having a fully defined shape with 3 t slots, and after finishing the sketch I made two holes for the brackets, that I'll use to hold the mobile each with 3.4 mm diameter, finally ended that component and extrude it to 3mm.

• I created another component for the stand of the mobile, first I selected the face that I wanted to make the stand on, and I made it as a rectangle with 30*50 mmm and then created two holes for the brackets with diameter 3.3 mmm finally finish the skitch and extrude the shape 3mm.

• I made another component for the base, so I select the end of the first component and make skitch, I chose the two sides of the t-slot that I made and select project tool, so automatically it will help to build the side on it without need to make the same steps and I made a rectangle with 30*50 mm and create the hole for the screw then finish the skitch and extrude the parts of it 3mm  .

• Another component from assembly tool for the side of the mobile holder, same as the above I chose the place of the t-slot and create skitch also I select the two sides of the t-slot and project them, create a rectangle with 50*70 mm and then finish and finally extrude it to 3 mm, and I used the tool joint and select the point to be joint as a one piece to the back of the mobile holder.

• The final component for the mobile holder was a copy from the above mentioned one, I select the skitch and make a copy of it also extrude it and join so the first thing I made was the mobile holder.

• FROM this steps I'll start the parts of the ben holder, I need three faces and one base:

• Component one was the base of the ben holder as I wanted to add one t- slot to be from the side(the end one) and the other side will be inserted into each other, so I created a rectangle with 50*50 mm, one side have t slot, and the other are having a rectangle 19*3mmm and end the skitch , extrude it into 3mm

• Component two will be the front side of the ben holder, I made it as a rectangle with 50*70 mm and I made another rectangle 6*70 and another one from the mid point of that small rectangle  3*35 mm to form the x -slot, then extrude and joint it with the side of the ben holder.

• Component three that will present the back side of the pen holder, which is copy from the above one except I made changes with the sketch to reverse the x slots, so it will be able to joint to the mobile holder.

• last component will be the end, I select the side of the ben holder's base and made it as a project so the t slot will be automatically selected, also I made the x- slot so it will be able to joint to the rest of the sides.

• finally I used the fillet to all the side that may be sharp with 1mm.

• To give my design the full requirements, and to be sure  from all of the dimensions, I uploaded the file of nut and screw and insert them into the design. then start to assemble them starting from the screw to the hole and then the nut.

• The last step was to save the file to update it to the next level in the software "CAD", I started to select each face and used the DXF extensions to  save it as DXF. and so one with the rest of the design till I got 9 dxf files.

• The design has more than side, some are similar so I used the tool of copy paste  of one side and  joint it to the mobile base, but I found that any change made with side is reflecting on the other side "X-slot", so I delete it and make a copy from the sketch itself not from the face and paste it as new.

• In the other side of the design "ben holder", when I assemble tow side together they get stuck on each other, so I tried to adjust the angle to make it 90 so I get the shape of box.

• After jointing, you can see that there is a space between side and the other in the x-slot, so I adjust the joint to make the distance 3mm and that worked really.

• I wanted to add some drawings, but the instructor highlighted that the side and the paint will not be one side and advised me to add it using the laser cad software so I can get them as one piece.

• I thought that I can save the design that have around 9 components as one dxf file, that not happened as I used the DXF extension to save each face in a file, and then Import all in the same time to the laser cad .