I use this machine mostly for these three uses: Slot cutting, flattening parts, chamfering.
 

I suggest designing your own router holder. Included one can occasionally get loose.

Mounting plate:
96 M3 mounting holes with 20mm spacing. Included accessories use M3x4x10 SHSS Machine screws from bambulab.

Main Hardware:
M5*45mm Hex socket bolt x20
M5 Nuts x28
¼"x¾" aluminum bar 500mm x4
6704ZZ bearing (27OD, 20OD, 4H) x8
685ZZ bearing (11OD, 5ID, 5H) x24
Steel rod (5D,10L) x8
T8 Lead nut, 2mm pitch x4 (8mm pitch can be used too)
T8 Lead screw 500mm, 2mm pitch x1 (8mm pitch can be used too)
T8 Lead screw 200mm, 2mm pitch x1 (8mm pitch can be used too)
MGN15C rail and carriage 150mm (combined height 16mm) x2
M3 nut x8
M3*130mm Hex socket screw x4 (or M3 threaded rod x4 + M3 nut x4)
M3*45mm Hex socket screw x4 (or M3 threaded rod x4 + M3 nut x4)
M3*12mm Hex socket screw x18 (For MGN15C carriage. May vary slightly for you)
M3*12mm Hex socket screw x6-14 (For MGN15 rail. May vary slightly for you. Depending on hole spacing and configuration of your rail.)
M3 nut x8
M3*4mm Heatset insert x104 (Plus some for MGN15 Rail, depending on your rail type, from 6 to 14)

Example Router Holder Hardware(Red assembly):
M6*40 Hex head bolt x2
M6 Nut x2
M5*10 Button head phillips screw x4
M5 nut x5
Steel rod (3D,50L) x4

Estimated cost: 75GBP (100USD)