The Construct you are bonded to is Humanoid. You are a fish in a bowl.

Your walking speed is 30 ft. If at any point you choose to leave both your construct and your bowl, you have a swimming speed of 50 ft.

When your construct is brought down to 0 HP you can use your reaction to eject the fishbowl head off of the construct to avoid falling unconscious. The fishbowl head has eight mechanical bronze spider legs that allow it to move around at a speed of 15ft.  Once ejected, all creatures within a 5ft radius must succeed a DC10 DEX saving throw or take 4d4 force damage as the construct implodes. Once the construct has imploded, the Fish must spend 2 hours of downtime to reform the construct.

The fishbowl has its own stat block.

Once you've used this racial trait, you must make a long rest before you can do so again.

Fishbowl Head Stats

Armor Class: 15

Hit Points: 20

Speed: 15ft., 15ft. Climbing

Actions:  

Leg Attack: Adding your  DEX and proficiency bonus to hit and damage deal 1d4 piercing damage.

Bonus Action:

Hide: Take the hide action as a bonus action

All other stats are equal to your normal stats.

The Construct doesn't require air, food, drink, or sleep.

Due to the nature of your experimentation and studies, you have gained the Telekinesis Feat.

You can see in dim light within 30 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

You can speak, read, and write Common and 1 other.

When determining your character's ability scores, increase three different scores by 1. Follow these rules regardless of the method you use to determine the scores, such as rolling or point buy.

While the Fishbowl head is connected to the Construct you have Disadvantage on Dexterity (Stealth) checks. But in your ejected state you gain Advantage on Dexterity (Stealth) checks.