Skyhopper's Helicopter mode is mainly a pale beige colour with lots of Decepticon purple visible inside the open compartment in front of the rotor blades mount. The Rotor Blades - both the main 2 bladed set and the smaller 4 bladed tail rotor - rotate freely. A rotating 5mm peg under the tail is used as a mount for a purple radar dish while here's a fixed 5mm post under the nose of the helicopter. This post plugs into a long grey gun with a 5mm hole in the top - there's also a 5mm post underneath the gun. Two more grey guns with moulded missiles are also supplied - each has a 5mm peg which allows them to be plugged into 5mm holes in the side of the helicopter. All 3 guns are capable of being used as hand weapons by larger Transformers robots with 5mm peg hole hands. An additional 5mm peg hole can be found on the top of the Helicopter's tail. The pilot's compartment contains a yellow stand with a peg for mounting a Micromaster on. Remove the yellow stand and you get a space large enough to seat a Star Wars figure in. A Transformers Legend should fit, but a basic will probably struggle due to the alt mode parts. I've had Universe Legends Megatron riding around in mine.
TF to Base Mode: Remove all three guns and the main rotors. Fold the sides of the Helicopter down and from there fold a platform out to each side. Split the nose of the Helicopter in two and fold out to the sides. Remove the stand. Fold the tail upwards to form a tower then rotate the top through 180 degrees so the radar dish faces forward. Fold the side panels of the tail - attached to the engines - out to the sides. The three Micromaster ramps included can now be attached - there's a pair of ramps with attachments at one end - these peg into the purple platforms at the sides of the helicopter. The ramp with the attachments at both ends goes on the front. The two missile guns can be mounted on the sides of the base, with the long gun at the base of the turret and the stand on top of one of the engines. There are several spare 5mm holes allowing you to customise the base to your own liking.
I like Skyhopper's base mode. It's rather dominated by the radar tower, but the base itself has a nice through road from one side connector to the other- unique amongst the larger bases, but the Airwave Battlestation can be similarly configured. The front road is at right angles to the through road making Skyhopper a good candidate to be placed near the centre of your Micromaster city. The ability to link the Micromaster bases together passed me by as a youngster - it's not publicised on the packaging and I never had one to open. The only things that don't quite work in this mode are the figure stand - everywhere you plug it in it looks slightly out of place - and a slight clash between the pale beige of the helicopter shell and the Decepticon purple of the base.
One of the better Western Micromaster base toys.
Skyhopper changes sides and is recoloured for it's Japanese release and this time is packed with Dead Wheeler, a red & black Cybertron (Autobot) repaint of Free Wheeler from the Micromaster Race Car Patrol.
The repaint is a straight colour swap:
Beige becomes white - mainly the Helicopter shell
Purple becomes blue - the base made interior and radar dish
Grey becomes red - the weapons, 5mm ports and engines.
The black of the rotors and yellow of the ramps & figure stand remains the same
Wonderfully attractive and rare toy (at the time of writing TFU have no pictures of the toy and neither do TFWiki.net or CobraIsland toys). So instead I'll link to the All your (Micromaster) Bases are belong to us thread on the Hub Forum and Stardub's Micromaster Asgard video on YouTube. Because the toy is so white it does have a tendency to yellow somewhat though !